BCM SUZUKI SX4 2006 1.G Service Workshop Manual

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Schematic and Routing Diagram
Immobilizer Control System Wiring Circuit DiagramS6RW0DA302001
NOTE
For more details about power supply circuit, ground wire circuit, and each circuit for ECM, BCM, ABS
control module, keyless start control module and combination meter, refer to “System Circuit Diagram
in Section 9A”.

BLK/WHT
BLK/ORN12V
G17-1
G17-2
12V
5V
12V
12VYEL/RED
YEL/BLK
G17-4
G17-3
5V
BRN
BRN/YEL
BLK/YEL
1 2
22
2 34
251014
15
1 2 3
4 G17
[A]
5
6
G16-20 G16-29 G16-30 G146-3 G146-7 G146-8
WHT/RED
5V
5V
9
G16-18G16-19 E01-13
E01-28
BLU
BLU
RED
WHTE08-12
E08-1E01-18
E01-3
RED
WHTE08-13
E08-2E04-1
E04-2
WHT
RED
G04-1
G04-3
12V
E04-9
G04-5
PPL/WHTL313-3 8
11
12
13
G17-5WHT 76
G17-6WHT/RED
17
REDWHT
REDWHT
G241-10 G241-7
IG1
18
WHT
REDG04-4
G04-2
16 [B]
I6RW0DA30001-02

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BLK/WHT
BLK/ORN12V
G17-1
G17-2
12V
5V
12V
12VYEL/RED
YEL/BLK
G17-4
G17-3
5V
BRNBRN/YELBLK/YEL
1 2
22
2 34
251014
15
1 2 3
4 G17
[A]
5
6
G16-20 G16-29 G16-30 G146-3 G146-7 G146-8
WHT/RED
5V
5V
9
G16-18G16-19 E01-13
E01-28
BLU
RED
WHTE08-12
E08-1E01-18
E01-3
RED
WHTE08-13
E08-2
WHT
RED
G05-4
G05-2
12V
G05-35 8
11
G17-5WHT 76
G17-6WHT/RED
17
REDWHT
REDWHT
G241-10 G241-7
IG1
18
WHT
REDG05-1
G05-3
16 [C]
I6RW0DA30002-01
[A]: ICM connector (harness side view) 5. ICM 12. To SDM
[B]: Junction block with BCM type 6. Illumination ring (if equipped) 13. To ABS control module
[C]: Junction block without BCM type 7. To BCM 14. Steering lock unit (keyless start model)
1. Battery 8. ABS control module 15. Keyless start control module (if equipped)
2. Fuse 9. DLC 16. CAN junction connector
3. Ignition switch 10. ECM 17. Combination meter
4. Junction block 11. BCM 18. Immobilizer indicator light

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DTC TableS6RW0DA304004
ECM
NOTE
ECM detects DTC. ICM does not.

NOTE
If any DTC other than the above DTCs is detected, refer to “DTC Table in Section 1A”.

DTC No. Detecting Item Detecting ConditionImmobilizer
Indicator
Light
) P1614 Transponder response errorTransponder code in transponder built in
ignition key cannot be read through ICM.Flash
) P1615 Steering lock unit communication error• While registering the transponder code in
the transponder built in the ignition key in
ECM, the keyless start control module sent
a signal to ECM indicating that the ID code
could not be registered.
• The ID code could not be registered in the
keyless start control module or ECM.Flash
) P1616 Unregistered keyless start control moduleECM detects different ID codes registered in
ECM and keyless start control module.Flash
) P1618Keyless start control module CAN
communication errorReception error of communication data for
keyless start control module is detected for
longer than specified time continuously.Flash
) P1621 Immobilizer communication line error Communication error between ICM and ECM. Flash
) P1622 EEPROM reading / writing error EEPROM in ECM is corrupted. Flash
) P1623 Unregistered transponderTransponder code in the transponder built in
the ignition key is invalid.Flash
) P1625 Immobilizer antenna error ICM is faulty. Flash
) P1636Immobilizer information registration
failureCommunication error between ECM and BCM. No operation
) P1638 Immobilizer information mismatched• Communication error between ECM and
BCM.
• Wrong ECM or BCM is used.No operation

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Immobilizer Indicator Light Does Not Come ON with Ignition Switch ON and Engine StopS6RW0DA304006
Wiring Diagram
Refer to “Immobilizer Control System Wiring Circuit Diagram”.
Circuit Description
When the ignition switch is turned ON, ECM transmits the indication ON signal to the combination meter to turn ON the
immobilizer indicator light in case that there is not any problem with the immobilizer control system. Then, the
combination meter turns ON the light. When the engine is started up, ECM transmits the indication OFF signal to the
combination meter to turn OFF the light. Then, the combination meter turns OFF the immobilizer indicator light.
However, in case that there is some trouble with the immobilizer control system, the immobilizer indicator light flashes
ON and OFF when the ignition switch is turned ON.
Troubleshooting
Step Action Yes No
1Immobilizer indicator light power supply check
1) Turn the ignition switch to ON position.
Do other warning lights come ON?Go to Step 2. Go to Step 4.
2DTC check of ECM
1) Check ECM for DTC referring to “DTC Check in Section
1A”.
Is DTC U0073, U0101, U0121 and/or U0140 detected?Go to applicable DTC
diag. flow.Go to Step 3.
3DTC check of BCM
1) Check BCM for DTC referring to “DTC Check in Section
10B”.
Is DTC U0073, U0100, U0101, U0155 and/or U1144
detected?Go to applicable DTC
diag. flow.Substitute a known-
good combination meter
and recheck. If
immobilizer indicator
light still remains OFF,
substitute a known-
good ECM and recheck.
4Fuse check
1) Turn the ignition switch to OFF position.
2) Check fuse for combination meter circuit.
Is fuse blown?Replace blown fuse,
and then check for
short.Go to Step 5.
5Combination meter power supply wire circuit check
1) Remove combination meter referring to “Combination
Meter Removal and Installation in Section 9C”.
2) Check for proper connection at terminals and wires of
combination meter connector.
3) If OK, turn the ignition switch to ON position and
measure voltage between power supply terminal of
combination meter and vehicle body ground. Refer to
“Combination Meter Circuit Diagram in Section 9C”.
Is it 10 – 14 V?Go to Step 6. Repair open in power
supply wire circuit.
6Combination meter ground wire circuit check
1) Turn ignition switch OFF position.
2) Measure resistance between ground terminal of
combination meter connector and vehicle body ground.
Refer to “Combination Meter Circuit Diagram in Section
9C”.
Is resistance 1
Ω or less?Substitute a known-
good combination meter
and recheck. If still
remains OFF, substitute
a known-good ECM and
recheck.Repair open or high
resistance in ground
circuit.

Downloaded from www.Manualslib.com manuals search engine 10C-10 Immobilizer Control System:
Immobilizer Indicator Light Remains ON after Engine StartS6RW0DA304007
Wiring Diagram
Refer to “Immobilizer Control System Wiring Circuit Diagram”.
Circuit Description
Refer to “Immobilizer Indicator Light Does Not Come ON with Ignition Switch ON and Engine Stop”.
Troubleshooting
DTC P1614: Transponder Response ErrorS6RW0DA304008
Wiring Diagram
Refer to “Immobilizer Control System Wiring Circuit Diagram”.
Detecting Condition and Trouble Area
TroubleshootingStep Action Yes No
1DTC check of ECM
1) Check ECM for DTC referring to “DTC Check in Section
1A”.
Is DTC detected?Go to applicable DTC
diag. flow.Go to Step 2.
2CAN communication circuit check
1) Disconnect connectors from ECM, BCM, ABS control
module and combination meter.
2) Check CAN communication circuit for open, short and
high resistance.
• Between ECM and ABS control module
• Between BCM and ABS control module
• Between BCM and combination meter
Is each CAN communication circuit in good condition?Substitute a known-
good combination meter
and recheck. If
immobilizer indicator
light still remains ON,
substitute a known-
good ECM and recheck.Repair circuit.
Detecting Condition Trouble Area
Transponder code in transponder built in ignition key
cannot be read through ICM.• Use of ignition key without transponder
• Use of unregistered ignition key
• Corruption of transponder in ignition key
•ICM
•ECM
Step Action Yes No
1Was “Immobilizer Control System Check” performed?Go to Step 2. Go to “Immobilizer
Control System Check”.
2DTC check of ECM
1) Check if any DTC other than P1614 is detected referring
to “DTC Check”.
Is DTC other than P1614 detected?Go to applicable DTC
diag. flow.Go to Step 3.
3Registration of ignition key in use with ECM
1) Register ignition key in use with ECM referring to
“Registration of the Ignition Key”.
Was registration of ignition key completed?Recheck DTC. Go to Step 4.
4Registration of the spare ignition key
1) Register the spare ignition key with ECM referring to
“Registration of the Ignition Key”.
Was registration of spare ignition key completed?Replace ignition key
which can not be
registered.Substitute a known-
good ECM and recheck.

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DTC P1615: Steering Lock Unit Communication ErrorS6RW0DA304009
Wiring Diagram
Refer to “Immobilizer Control System Wiring Circuit Diagram”.
Circuit Description
When the transponder code in the ignition key is registered in ECM, the ID code is registered in both ECM and keyless
start control module at the same time. This DTC is detected only in case that the ID code cannot be registered in both
ECM and keyless start control module when the transponder code in the ignition key is registered in ECM.
NOTE
• Troubleshoot DTC P1618 first if both DTC P1615 and P1618 are detected at the same time.
• After replacing ECM, be sure to register the transponder code in the ignition key with ECM referring
to “Registration of the Ignition Key”. After replacing the keyless start control module of the vehicle
equipped with the keyless start system, be sure to perform “Registration of the Ignition Key”.

Detecting Condition and Trouble Area
TroubleshootingDetecting Condition Trouble Area
• While registering the transponder code in ECM, the
keyless start control module sent a signal to ECM
indicating that the ID code could not be registered.
• The ID code could not be registered in the keyless start
control module or ECM.• Wire circuits between steering lock unit and keyless
start control module
• CAN communication circuit
• Steering lock unit
• Keyless start control module
• Combination meter
• TCM (if equipped)
• 4WD control module (if equipped)
• ABS control module
•BCM
•ECM
Step Action Yes No
1Was “Immobilizer Control System Check” performed?Go to Step 2. Go to “Immobilizer
Control System Check”.
2Registration of ignition key
1) Register ignition key in use with ECM referring to
“Registration of the Ignition Key”.
Was registration of ignition key completed?Recheck ECM for DTC.
If DTC P1615 is still
detected, go to Step 3.Go to Step 3.
3DTC check of ECM
1) Check ECM for DTC referring to “DTC Check in Section
1A”.
Is DTC U0073, U0101, U0121 and/or U0140 detected?Go to applicable DTC
diag. flow.Go to Step 4.
4DTC check of keyless start control module
1) Check keyless start control module for DTC referring to
“DTC Check in Section 10E”.
Is DTC detected?Go to applicable DTC
diag. flow.Go to Step 5.
5Check for communication circuit between steering lock
unit and keyless start control module
1) Check for open, short, and high resistance in steering
lock unit circuit. Refer to Step 2 in “DTC No. 11:
Communication Error with Steering Lock Unit in Section
10E”.
Is each circuit in good condition?Go to Step 6. Repair malfunction part
and recheck.

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DTC P1625: Immobilizer Antenna ErrorS6RW0DA304015
Wiring Diagram
Refer to “Immobilizer Control System Wiring Circuit Diagram”.
Detecting Condition and Trouble Area
Troubleshooting
DTC P1636: Immobilizer Information Registration FailureS6RW0DA304016
Wiring Diagram
Refer to “Immobilizer Control System Wiring Circuit Diagram”.
Detecting Condition and Trouble Area
TroubleshootingDetecting Condition Trouble Area
ICM is faulty. • ICM
•ECM
Step Action Yes No
1Was “Immobilizer Control System Check” performed?Go to Step 2. Go to “Immobilizer
Control System Check”.
2DTC confirmation
1) Clear DTC referring to “DTC Clearance”.
2) Turn the ignition switch to OFF position.
3) Check DTC referring to “DTC Check”.
Is DTC P1625 still detected?Substitute a known-
good ICM and recheck
DTC. If DTC P1625 is
still detected, substitute
a known-good ECM and
recheck.Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
Detecting Condition Trouble Area
The registration of the immobilizer control system
information in ECM is failed.• CAN communication circuit
• Keyless start control module (if equipped)
• Combination meter
• TCM (A/T model)
• 4WD control module (if equipped)
• ABS control module
•BCM
•ECM
Step Action Yes No
1Was “Immobilizer Control System Check” performed?Go to Step 2. Go to “Immobilizer
Control System Check”.
2DTC check of ECM
1) Check ECM for DTC referring to “DTC Check in Section
1A”.
Is DTC U0073, U0101, U0121 and/or U0140 detected?Go to applicable DTC
diag. flow.Go to Step 3.
3DTC check of BCM
1) Check BCM for DTC referring to “DTC Check in Section
10B”.
Is DTC U0073, U0100, U0101, U0155 and/or U1144
detected?Go to applicable DTC
diag. flow.Go to Step 4.

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DTC P1638: Immobilizer Information MismatchedS6RW0DA304017
Wiring Diagram
Refer to “Immobilizer Control System Wiring Circuit Diagram”.
Detecting Condition and Trouble Area
Troubleshooting4CAN communication circuit check
1) Disconnect connectors from ECM, BCM and ABS
control module.
2) Check CAN communication circuit for open, short and
high resistance.
• Between ECM and ABS control module
• Between BCM and ABS control module
Is each CAN communication circuit in good condition?Go to Step 5. Repair circuit.
5Replacement of BCM
1) Replace BCM with new one referring to “BCM (Included
in Junction Block) Removal and Installation in Section
10B”.
2) Check ECM for DTC referring to “DTC Check”.
Is DTC P1636 still detected?Substitute a known-
good ECM and recheck.BCM faulty. Step Action Yes No
Detecting Condition Trouble Area
• The immobilizer control system information in ECM and
the one in BCM does not match.
• The registration of the immobilizer control system
information in ECM is failed.• Use of the wrong ECM
• CAN communication circuit
• Keyless start control module (if equipped)
• Combination meter
• TCM (A/T model)
• 4WD control module (if equipped)
• ABS control module
•BCM
•ECM
Step Action Yes No
1Was “Immobilizer Control System Check” performed?Go to Step 2. Go to “Immobilizer
Control System Check”.
2DTC confirmation
1) Disconnect negative (–) cable from battery for more than
5 seconds.
2) Connect negative (–) cable to battery.
3) Check if any DTC is detected referring to “DTC Check”.
Is DTC P1638 still detected?Go to Step 3. Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
3ECM specification check
1) Check ECM part number to see if ECM is applicable to
the vehicle in service.
Is a correct ECM used for the vehicle in service?Go to Step 4. Replace ECM with the
correct one and recheck
if DTC P1638 is still
detected by ECM.
4DTC check of ECM
1) Check ECM for DTC referring to “DTC Check in Section
1A”.
Is DTC U0073, U0101, U0121 and/or U0140 detected?Go to applicable DTC
diag. flow.Go to Step 5.

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Inspection of ICM and Its CircuitS6RW0DA304018
ICM and its circuit can be checked at ICM wiring connector by measuring voltage.
CAUTION!
ICM cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to ICM with
connector disconnected from it.

Voltage Check
1) Remove ICM (1) from steering lock assembly or steering lock unit referring to “ICM Removal and Installation”.
2) Connect ICM connector (2) to ICM.
3) Check voltage at each terminal.
NOTE
As each terminal voltage is affected by the battery voltage, confirm that it is 11 V or more when the
ignition switch is turned to ON position.

5DTC check of BCM
1) Check BCM for DTC referring to “DTC Check in Section
10B”.
Is DTC U0073, U0100, U0101, U0155 and/or U1144
detected?Go to applicable DTC
diag. flow.Go to Step 6.
6CAN communication circuit check
1) Disconnect connectors from ECM, BCM and ABS
control module.
2) Check CAN communication circuit for open, short and
high resistance.
• Between ECM and ABS control module
• Between BCM and ABS control module
Is each CAN communication circuit in good condition?Go to Step 7. Repair circuit.
7Replacement of BCM
1) Replace BCM with new one referring to “BCM (Included
in Junction Block) Removal and Installation in Section
10B”.
2) Check ECM for DTC referring to “DTC Check”.
Is DTC P1638 still detected?Substitute a known-
good ECM and recheck.BCM faulty. Step Action Yes No
1 2 3
4
1
25
6 [A]
I6RW0BA30003-01
[A]: ICM connector (harness side view)

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Control Systems
Keyless Start System
General Description
Keyless Start System DescriptionS6RW0DA501001
Keyless start system consisting of the parts shown below has three functions as described below.
• Keyless engine start function:
With the remote controller which has been registered in the keyless start control module carried with oneself, the
engine can be started without using the ignition key.
• Door lock function:
Pushing the request switch incorporated in the outside handle of the driver side door, passenger side door or rear
end door while carrying the remote controller which has been registered in the keyless start control module, doors
can be locked or unlocked.
• Keyless entry system function:
It is possible to lock or unlock doors by pushing the lock or unlock button of remote controller.
The keyless start control module can accept registration of up to four remote controllers.
3
2
11
104
8
5
3
6
7
1
14
13
9
12 [A]
12[B]
I6RW0DA50001-01
[A]: Junction block with BCM type 5. Luggage room antenna 11. Unlock button
[B]: Junction block without BCM type 6. Driver side door antenna 12. BCM
1. Keyless start control module 7. Passenger side door antenna 13. Key indicator light
2. Remote controller 8. Rear end door antenna 14. ECM
3. Request switch 9. Steering lock unit
4. Center antenna 10. Lock button