ACURA CSX 2006 Service Repair Manual

SRS Unit DTCDetection Item Notes
24-31
32-1xOpen in the front passenger’s side airbag inflator (see page 24-99)
32-3x Short to another wire or decreased resistance in the front passenger’s side airbag
inflator (see page 24-100)
32-8x Short to power in the front passenger’s side airbag inflator (see page 24-102)
32-9x Short to ground in the front passenger’s side airbag inflator (see page 24-104)
33-1x Open in the left side curtain airbag inflator (see page 24-106)
33-3x Short to another wire or decreased resistance in the left side curtain airbag inflator (see page 24-107)
33-8x Short to power in the left side curtain airbag inflator (see page 24-109)
33-9x Short to ground in the left side curtain airbag inflator (see page 24-111)
34-1x Open in the right side curtain airbag inflator (see page 24-113)
34-3x Short to another wire or decreased resistance in the right side curtain airbag
inflator (see page 24-115)
34-8x Short to power in the right side curtain airbag inflator (see page 24-117)
34-9x Short to ground in the right side curtain airbag inflator (see page 24-118)
41-1x No signal from the left front impact sensor (see page 24-120)
41-2x Internal failure of the left front impact sensor (see page 24-125)
41-3x
41-Bx 42-1x No signal from the right front impact sensor (see page 24-122)
42-2x Internal failure of the right front impact sensor (see page 24-125)
42-3x
42-Bx 43-1x No signal from the left side impact sensor (first) (see page 24-126)
43-2x Internal failure of the left side impact sensor (first) (see page 24-131)
43-3x
43-Bx 44-1x No signal from the right side impact sensor (first) (see page 24-128)
44-2x Internal failure of the right side impact sensor (first) (see page 24-131)
44-3x
44-Bx 45-1x No signal from the left side impact sensor (second) (see page 24-132)
45-2x Internal failure of the left side impact sensor (second) (see page 24-137)
45-3x
45-Bx 46-1x No signal from the right side impact sensor (second) (see page 24-134)
46-2x Internal failure of the right side impact sensor (second) (see page 24-137)
46-3x
46-Bx 51-xx Internal failure of the SRS unit (see page 24-138)
52-xx
53-xx
54-xx
55-xx
61-1x Open in the driver’s seat belt buckle switch (see page 24-139)
61-2x Short in the driver’s seat belt buckle switch (see page 24-141)
62-1x Open in the front passenger’s seat belt buckle switch (see page 24-142)
62-2x Short in the front passenger’s seat belt buckle switch (see page 24-143)
71-1x Open in the driver’s seat position sensor (see page 24-144)
71-2x Short in the driver’s seat position sensor (see page 24-145)
81-4x Internal failure of the ODS unit (see page 24-149)
81-5x
81-61 No signal from the ODS unit (see page 24-147)
81-62 Non-stipulated data from the ODS unit
81-63 Internal failure of the ODS unit (see page 24-149)
81-64
81-71 ODS unit does not calibrate (see page 24-150)
81-78
81-79 Front passenger’s weight sensors initial check failure
NOTE: The ‘‘x’’ at the end of each DTC denotes a numeric character (0 thru 9) or an alpha character (A thru F) that you will see on the HDS display. The character is unrelated to your troubleshooting; it designates the SRS unit manufacturer and other detail used for product
analysis.
(cont’d)
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SRS Unit DTCDetection Item Notes
24-32SRS
DTC Troubleshooting Index (cont’d)
82-14
No signal from the front passenger’s weight sensor (front inner side) (see page 24-151)
82-15 Internal failure of the front passenger’s weight sensor (front inner side) (see page 24-155)
82-16 No signal from the front passenger’s weight sensor (rear inner side) (see page 24-156)
82-17 Internal failure of the front passenger’s weight sensor (rear inner side) (see page 24-155)
83-24 No signal from the front passenger’s weight sensor (front outer side) (see page 24-159)
82-25 Internal failure of the front passenger’s weight sensor (front outer side) (see page 24-155)
83-26 No signal from the front passenger’s weight sensor (rear outer side) (see page 24-163)
82-27 Internal failure of the front passenger’s weight sensor (rear outer side) (see page 24-155)
85-4x Internal failure of the ODS unit (see page 24-166)
85-5x
85-61 No signal from the ODS unit (see page 24-147)
85-62 Non-stipulated data from the ODS unit
85-63 Internal failure of the ODS unit (see page 24-166)
85-64
85-71 ODS unit not initialize (see page 24-167)
85-78
85-79 OPDS sensor initial check failure
86-1x Faulty OPDS seat-back sensor (see page 24-168)
86-2x Faulty OPDS seat support sensor
92-1x Open in the passenger’s airbag cutoff indicator (see page 24-169)
92-2x Open or short to ground in the passenger’s airbag cutoff indicator (see page 24-170)
A1-1x Faulty power supply (VA line) (see page 24-171)
A2-1x Faulty power supply (VB line) (see page 24-173)
B2-1x No signal from the rear safing sensor (see page 24-174)
B2-17 Internal failure of the rear safing sensor (see page 24-177)
B2-8x
B2-9x
B2-Ax B2-Bx Ex-11 Control operation recorded (see page 24-138)
Fx-11 Airbags and/or tensioners deployment recorded (see page 24-139)
NOTE: The ‘‘x’’ at the end of each DTC denotes a numeric character (0 thru 9) or an alpha character (A thru F) that you will see on the HDS display. The character is unrelated to your troubleshooting; it designates the SRS unit manufacturer and other detail used for product
analysis.
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SWS DTC IndexSRS Unit DTC SWS DTC Detection Item Notes
24-33
Only read DTCs from the SRS menu, not from the SWS menus unless instructed to check SWS DTCs. SWS (ODS unit)
DTCs are subcodes of SRS unit DTCs. Only troubleshoot the corresponding SRS DTCs.
81-4x 41-xx Internal failure of the ODS unit (see page 24-178) 42-xx
43-xx
82-14 14-11 Short to power in the front passenger’s weight sensor (front inner side) power circuit (see page 24-179)
14-12 Short to ground in the front passenger’s weight sensor (front inner side) power circuit
14-13 Open in the front passenger’s weight sensor (front inner side) output circuit
14-14 Short to ground in the front passenger’s weight sensor (front inner side) output circuit
82-15 15-3x Internal failure of the front passenger’s weight sensor (front inner side) (see page 24-181)
82-16 16-11 Short to power in the front passenger’s weight sensor (rear inner side) power circuit (see page 24-179)
16-12 Short to ground in the front passenger’s weight sensor (rear inner side) power circuit
16-13 Open in the front passenger’s weight sensor (rear inner side) output circuit
16-14 Short to ground in the front passenger’s weight sensor (rear inner side) output circuit
82-17 17-3x Internal failure of the front passenger’s weight sensor (rear inner side) (see page 24-181)
83-24 24-11 Short to power in the front passenger’s weight sensor (front outer side) power circuit (see page 24-180)
24-12 Short to ground in the front passenger’s weight sensor (front outer side) power circuit
24-13 Open in the front passenger’s weight sensor (front outer side) output circuit
24-14 Short to ground in the front passenger’s weight sensor (front outer side) output circuit
83-25 25-3x Internal failure of the front passenger’s weight sensor (front outer side) (see page 24-181)
83-26 26-11 Short to power in the front passenger’s weight sensor (rear outer side) power circuit (see page 24-180)
26-12 Short to ground in the front passenger’s weight sensor (rear outer side) power circuit
26-13 Open in the front passenger’s weight sensor (rear outer side) output circuit
26-14 Short to ground in the front passenger’s weight sensor (rear outer side) output circuit
83-27 27-3x Internal failure of the front passenger’s weight sensor (rear outer side) (see page 24-181)
81-71 71-xx ODS unit does not calibrate (see page 24-178)
NOTE: The ‘‘x’’ at the end of each DTC denotes a numeric character (0 thru 9) or an alpha character (A thru F) that you will see on the HDS display. The character is unrelated to your troubleshooting; it designates the SRS unit
manufacturer and other detail used for product analysis.
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Symptom Diagnostic procedure Also check for
24-34
SRS
Symptom Troubleshooting Index








SRS indicator does not come on Symptom Troubleshooting (see page 24-
181) Communication with the
HDS
SRS indicator stays on, but no DTCs
are stored Symptom Troubleshooting (see page 24-
182) Charging system for
under or overcharging
Communication with the
HDS
Side airbag cutoff indicator flashes Check the DTC. If a DTC indicated, go to the DTC troubleshooting ODS Initialization
Communication with the
HDS
Side airbag cutoff indicator stays on Symptom Troubleshooting (see page 24- 183) Communication with the
HDS
Side airbag cutoff indicator does not
come on Symptom Troubleshooting (see page 24-
183) Initialize the ODS unit
Communication with the
HDS
Passenger’s airbag cutoff indicator
flashes Check the DTC. If a DTC indicated, go to the
DTC troubleshooting Calibration the ODS unit
Communication with the
HDS
Passenger’s airbag cutoff indicator
stays on or comes on suddenly Symptom Troubleshooting (see page 24-
184) Communication with the
HDS
Passenger’s airbag cutoff indicator
does not come on Check the DTC. If a DTC indicated, go to the
DTC troubleshooting Communication with the
HDS
HDS does not communicate with the
SRS unit or the vehicle Troubleshoot the DLC circuit (see page
11-204). Communication with the
HDS
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SRS Components
Airbags
Front Passenger’s Weight Sensors
Driver’s Seat Position Sensor
24-35
System Description
AB
C
D
EF
M
E
I G J
F
L
L
G
H
O N
The SRS is a safety device which, when used with the seat belt, is designed to help protect the driver and front
passenger in a frontal impact exceeding a certain set limit. The system consists of the SRS unit, including safing
sensor and impact sensor (A), the cable reel (B), the driver’s airbag (C), the front passenger’s airbag (D), side airbags
(E), side curtain airbags (F), seat belt tensioners (G), seat belt buckle tensioners (H), side impact sensors (first) (I), front
impact sensors (J), rear safing sensor (K) and side impact sensors (second) (L).
Since the driver’s and front passenger’s airbags use the same sensors, both normally inflate at the same time.
However, it is possible for only one airbag to inflate. This can occur when collision severity is near the threshold for
airbag deployment. In such cases, the SRS system will only deploy airbags when the protection provided by the seat
belt is insufficient.
The front passenger’s weight sensors (M) are part of seat base. The front passenger’s weight sensors detect the
weight on the seat, and send the information to the ODS unit (N). If the total weight is about 30 kg (65 lbs) or less, the
ODS unit sends a signal to the SRS unit to prevent the passenger’s airbag from deploying. When the passenger’s
airbag is disabled, the passenger airbag cutoff indicator on the center panel comes on to alert the driver that the front
passenger’s airbag will not deploy in a front-end collision.
The driver’s seat position sensor (O) is under the driver’s seat on the left side. When the driver’s seat is moved to its
full forward position, the deployment of the driver’s airbag is moderated to decrease its force of impact during a front-
end collision.
(cont’d)
08/08/21 13:55:33 61SNR030_240_0035
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Rear Safing Sensor
For the SRS to operate:
Seat Belt Tensioners and Seat Belt Buckle Tensioners
Driver’s and Front Passenger’s Airbag(s)
Side Airbag(s)
Side Curtain Airbag(s)
Side Airbag Cutoff Indicator/OPDS Operation
Passenger Airbag Cutoff Indicator
SRS Operation
24-36SRS
System Description (cont’d)
The rear safing sensor is located under the rear seat. The rear safing sensor performs the same basic function as the
safing sensor in the SRS unit. It measures sideways G force, such as the force the vehicle would receive in a side
collision in the rear, and sends that information to the SRS unit. The SRS unit uses that information, and the
information from the second side impact sensors to determine the side that is impacted and the force. If the threshold
is met, the SRS unit deploys the side airbag, the side curtain airbag, and the seat belt tensioner on that side.
The indicator comes on when the front passenger’s seat is occupied by a small adult or child who is leaning into the
deployment path, or when an object (grocery bag, briefcase, purse, etc.) is in the seat. This indicates the passenger’s
side airbag is off and will not deploy; there is no problem with the side airbag. If the passenger sits upright or moves
to another seat, or you remove the object from the seat, the light should go off. There will be some delay between the
occupant’s repositioning and when the indicator will turn on or off.
The indicator comes on if the weight on the front passenger’s seat is about 30 kg (65 lbs) or less. This indicates the
passenger’s front airbag is off and will not deploy. The front airbag is shut off to reduce the chance of airbag-caused
injuries.
The main circuit in the SRS unit senses and analyzes the force of impact and, if necessary, ignites the inflator charges.
If battery voltage is too low or power is disconnected due to the impact, the voltage regulator and the back-up power
circuit will keep voltage at a constant level.
(1) A front impact sensor, side impact sensor, or the rear safing sensor must activate and send electric signals to the
microprocessor.
(2) The microprocessor must compute the signals and trigger the tensioners.
(3) The charges must ignite and deploy the tensioners.
(1) A front impact sensor must activate and send electric signals to the microprocessor.
(2) The microprocessor must compute the signals and trigger the airbag inflator(s).
(3) The triggered inflators must ignite and deploy the airbags.
(1) A side impact sensor must activate and send electric signals to the microprocessor.
(2) The microprocessor must compute the signals and trigger the side airbag inflator(s). However, the microprocessor
does not trigger the front passenger’s side airbag if the SRS unit determines that the front passenger’s head is in the
deployment path of the side airbag.
(3) The inflator that receives the signal must ignite and deploy the side airbags.
(1) A side impact sensor or the rear safing sensor must activate, and send electrical signals to the microprocessor.
(2) The microprocessor must compute the signals and trigger the side curtain airbag and side airbag inflator(s).
(3) The triggered inflators must ignite and deploy the side curtain airbag and side airbag at the same time.
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µ
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Self-diagnostic System
24-37
GAUGE CONTROL MODULE CAN
CAN
MICROPROCESSOR and DIAGNOSTIC CIRCUIT
SRS UNIT
IMPACT GND TRIGGER CIRCUIT
SCS
MES
DLC
VA VB
ODS UNIT
FRONT
PASSENGER’S SEAT
OPDS
SENSOR RIGHT
SIDE IMPACT
SENSOR
(SECOND)
REAR
SAFING
SENSOR
FRONT
PASSENGER’S
SEAT BELT
BUCKLE
TENSIONER
CABLE
REEL
DRIVER’S
AIRBAG
FIRST
INFLATOR
DRIVER’S
AIRBAG
SECOND
INFLATOR FRONT
PASSENGER’S
AIRBAG
SECOND
INFLATOR
FRONT
PASSENGER’S
AIRBAG
FIRST
INFLATOR
SRS
INDICATOR
SIDE AIRBAG
CUTOFF
INDICATOR
DRIVER’S
SEAT BELT
BUCKLE
TENSIONER
FRONT
PASSENGER’S
SEAT BELT
TENSIONER
DRIVER’S
SEAT BELT
TENSIONER
RIGHT SIDE
CURTAIN
AIRBAG
INFLATOR
LEFT SIDE
CURTAIN
AIRBAG
INFLATOR
DATA
LINK
CIRCUIT
MEMORY
CIRCUIT
SIDE
IMPACT
SENSOR FRONT
IMPACT
SENSOR POWER
SUPPLY
CIRCUIT LEFT
FRONT
IMPACT
SENSOR
RIGHT
FRONT
IMPACT
SENSOR LEFT
SIDE IMPACT
SENSOR
(FIRST)
RIGHT
SIDE IMPACT
SENSOR
(FIRST)DRIVER’S
SIDE AIRBAG
INFLATOR
FRONT
PASSENGER’S
SIDE AIRBAG
INFLATOR
UNDER-DASH
FUSE/RELAY
BOX LEFT
SIDE IMPACT
SENSOR
(SECOND)
FRONT
PASSENGER’S
WEIGHT
SENSORS
FRONT
PASSENGER’S
AIRBAG
CUTOFF
INDICATOR
DRIVER’S SEAT
POSITION
SENSOR
A self-diagnostic circuit is built into the SRS unit; when the ignition switch is turned to ON (II), the SRS indicator comes
on and goes off after about 6 seconds if the system is operating normally.
If the indicator does not come on, or does not go off after 6 seconds, or comes on while driving, it indicates an
abnormality in the system. The system must be inspected and repaired as soon as possible.
For better serviceability, the SRS unit memory stores a DTCs related to the cause of the malfunction, and the unit is
connected to the data link connector (DLC). This information can be read with the HDS when it is connected to the DLC
(see page 24-22).
NOTE: Before you disconnect the negative cable from battery for troubleshooting, review Battery Terminal
Disconnection and Reconnection (see page 22-68).
(cont’d)
08/08/21 13:55:34 61SNR030_240_0037
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SRS Unit Inputs and Outputs at Connector A (28P)
Terminal
Number Wire Color Terminal Name Description
24-38SRS
System Description (cont’d)
1 GRN
LA2Power source for the driver’s airbag second inflator
2 PUR LA2Ground for the driver’s airbag second inflator
3 LT GRN RA2Power source for the front passenger’s airbag second inflator
4 LT BLU RA2Ground for the front passenger’s airbag second inflator
5 LT GRN MES Memory clear signal input
6 ORN SCSService check signal input
7 LT BLU LA1Power source for the driver’s airbag first inflator
8 BRN LA1Ground for the driver’s airbag first inflator
9 YEL RA1Power source for the front passenger’s airbag first inflator
10 BLU RA1Ground for the front passenger’s airbag first inflator
11 WHT CAN HI Sends and receives communication signal with gauge control
module
12 RED CAN LO Sends and receives communication signal with gauge control
module
13 BLU PTTPassenger’s airbag cutoff indicator output line
14 GRN ODS Sends and receives communication signal with the ODS unit
15 BRN LFSGround for the left front impact sensor
16 LT BLU RFSGround for the right front impact sensor
17 YEL VASRS system sub power (common with ODS)
18 RED VBSRS dedicated power (dedicated booster circuit)
22 BLK SRS GND (1) Ground circuit for the SRS (G 506)
23 BLK SRS GND (2) Ground circuit for the SRS (G 506)
24 LT BLU K-LINE Sends and receives scan tool signal (serial data)
27 RED LFSPower source for the left front impact sensor
28 GRN RFSPower source for the right front impact sensor
NOTE: BLU or BRN wires may be substituted for the wire colors in this table.
Wire side of female terminals
08/08/21 13:55:34 61SNR030_240_0038
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SRS Unit Inputs and Outputs at Connector B (28P)
Terminal
Number Wire Color Terminal Name Description
24-39
1 RED
LRPPower source for the driver’s seat belt tensioner
2 BRN LRPGround for the driver’s seat belt tensioner
3 GRN RRPPower source for the front passenger’s seat belt tensioner
4 LT BLU RRPGround for the front passenger’s seat belt tensioner
5 GRY SSGround for the driver’s seat position sensor
6 LT GRN SSPower source for the driver’s seat position sensor
7 ORN LBPPower source for the driver’s buckle tensioner
8 GRN LBPGround for the driver’s buckle tensioner
9 YEL RBPPower source for the front passenger’s buckle tensioner
10 WHT RBPGround for the front passenger’s buckle tensioner
11 YEL LBSC Driver’s seat belt buckle switch un-buckled signal
12 LT GRN LBSO Driver’s seat belt buckle switch buckled signal
15 BLU RBSC Front passenger’s seat belt buckle switch un-buckled signal
16 ORN RBSO Front passenger’s seat belt buckle switch buckled signal
17 GRN LSAPower source for the driver’s side airbag inflator
18 RED LSAGround for the driver’s side airbag inflator
19 WHT RSAPower source for the front passenger’s side airbag inflator
20 BLU RSAGround for the front passenger’s side airbag inflator
21 BRN LCA1Power source for the left side curtain airbag inflator
22 BLU LCA1Ground for the left side curtain airbag inflator
23 GRY RCA1Power source for the right side curtain airbag inflator
24 RED RCA1Ground for the right side curtain airbag inflator
25 PNK LBS1Power source for the left side impact sensor (first), left side
impact sensor (second), and rear safing sensor
26 BLU LBS1Ground for the left side impact sensor (first), left side impact
sensor (second), and rear safing sensor
27 BRN RBS1Power source for the right side impact sensor (first), right side
impact sensor (second)
28 YEL RBS1Ground for the right side impact sensor (first), right side impact
sensor (second)
NOTE: BLU or BRN wires may be substituted for the wire colors in this table.
Wire side of female terminals
08/08/21 13:55:34 61SNR030_240_0039
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Î(#') ’06 model
24-40SRS
Circuit Diagram
GRN
BLU YEL
214 Q
E
G504
G602
BLK
LT GRN*
BLK*
BLK*
ORN*
LT BLU*
WHT*
RED* BLU*RED*
YEL*
2 1
G506 5
22
23 13 BLU
MICURED
2
4 MICU
GRY
YEL YEL
3
1
17 Vs
Vo
Vs
Vo
Vs
Vo
Vs
Vo BLU
BRN
5
10 15
GRY
123 3 21
LT GRN
16
11 6
GRY
BLU
GRN RED
4
914
WHT
123
321
BLK
13
83
RED
BRN MAIN CIRCUIT
VB
VA
WHT
GAUGE CONTROL MODULE (TACH)
BLK
412 SRS UNIT
ODS UNIT
7112 No. 9
(7.5 A) (7.5 A)
No. 10
No. 11
(10 A)
8
9 41
BRN
BLK
YEL
BLU GRN J
BATTERY
BAT
IG1
IGNITION SWITCH
UNDER-DASH FUSE/RELAY BOX
BLK
GRN
WHT BRN
A17
DRIVE CIRCUIT DRIVE CIRCUIT F-CAN TRANSCEIVER
16 1 19 WHT RED
A
A6
24
ORN
LT BLU
A
11 12 17 18
UNDER-HOOD
FUSE/RELAY BOX
DATA LINK
CONNECTOR
(DLC)
JUNCTION
CONNECTOR
JUNCTION
CONNECTOR
SEAT BELT
REMINDER
INDICATOR
SIDE
AIRBAG
CUTOFF
INDICATOR
SRS
INDICATORJUNCTION
CONNECTOR
To
SRS
UNIT ODS
UNIT
HARNESS OPDS
SENSOR
JUNCTION
CONNECTOR DASHBOARD
WIRE
HARNESS
FRONT
PASSENGER’S
WEIGHT
SENSOR
(FRONT
INNER
SIDE) FRONT
PASSENGER’S
WEIGHT
SENSOR
(REAR
INNER
SIDE) FRONT
PASSENGER’S
WEIGHT
SENSOR
(FRONT
OUTER
SIDE)FRONT
PASSENGER’S
WEIGHT
SENSOR
(REAR
OUTER
SIDE)
DASHBOARD
WIRE
HARNESS
FLOOR
WIRE
HARNESS
DASHBOARD
WIRE
HARNESS
PASSENGER’S
AIRBAG CUTOFF
INDICATOR
JUNCTION
CONNECTOR
MEMORY
ERASE
SIGNAL
(MES)
CONNECTOR
(2P)
FRONT
PASSENGER’S
SEAT
WIRE
HARNESS
(With
seat heater)
C783 C782
18P CAN
HI
CAN
LO
K-LINE SCS MES
SRS
GND (2)
SRS
GND (1)
a
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