PS control module SUZUKI SWIFT 2008 2.G Service Workshop Manual

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7Wire harness check
1) Connect connector to HVAC control module with ignition
switch turned OFF.
2) Measure voltage between “GRY/RED” wire terminal of temperature control actuator connector and vehicle body
ground with ignition switch turned ON when temperature
selector is operation to HOT direction.
Is voltage 10 – 14 V? Go to Step 11. Go to Step 8.
8 Wire harness check
1) Disconnect connector from HVAC control module with
ignition switch turned OFF.
2) Check for proper connection to HVAC control module connector at “G51-3” and “G51-4” terminals.
3) If OK, measure resistance between “GRY/RED” wire terminal of temperature control actuator connector and
“G51-4” terminal of HVAC control module connector.
Is resistance below 5
Ω? Go to Step 9. “GRY/RED” wire open
or high resistance
circuit.
9 Wire harness check
1) Measure resistance between “GRY/RED” wire terminal
of temperature control actuator connector and vehicle
body ground.
Is resistance infinity? Go to Step 10. “GRY/RED” wire
shorted to ground
circuit.
10 Wire harness check
1) Measure voltage between “GRY/RED” wire terminal of
temperature control actuator connector and vehicle body
ground with ignition switch turned ON.
Is voltage 0 V? Go to Step 11. “GRY/RED” wire
shorted to other circuit.
11 Position sensor circuit check
1) Check temperature control actuator position sensor
circuit referring to Step 1 to Step 5 and Step 10 to Step
11 of “DTC B1511: Temperature Control Actuator
(Position Sensor) and/or Its Circuit Malfunction”.
Is it in good condition? Go to Step 12. Repair circuit.
12 Temperature control actuator check
1) Check temperature control actuator referring to
“Temperature Control Actuator Inspection”.
Is it in good condition? HVAC control module
faulty.
Temperature control
actuator faulty.
Step Action Yes No

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DTC B1514: Air Flow Control Actuator and/or Its Circuit MalfunctionS7RS0B7224016
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
NOTE
• When DTC B1502, B1503 and B1513 are indicated together, it is possible that “ORN” wire circuit open.
• When DTC B1513 is indicated together, it is possible that “WHT” wire circuit open.

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M 12V
5V 5V
WHT/BLU
WHT
BRN/WHT
BRN/YEL
2
1
ORN
G51-1
G51-2
G52-1
G52-14
G52-3
3
4
I5RS0A722014-01
1. HVAC control module 2. Air flow control actuator3. To temperature control actuator 4. To other sensors
DTC Detecting Condition Trouble Area
Difference between target opening and actual opening is higher than
specified value even though air flow control actuator has operated for 16
seconds. • Air flow control actuator circuit
• Air flow control linkage
• Air flow control actuator
• HVAC unit
• HVAC control module
Step
Action YesNo
1 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ON ignition switch and check DTC.
Is there DTC B1512? Go to applicable DTC
diag. flow.
Go to Step 2.
2 Visual check
1) Check if there is any obstruction in operating range of
actuator linkage and if actuator linkage operates
smoothly.
Is it in good condition? Go to Step 3.
Obstruction in operating
range of actuator
linkage, actuator linkage
faulty and/or internal
fault of HVAC unit.
3 Wire harness check
1) Disconnect connector from air flow control actuator with
ignition switch turned OFF.
2) Check for proper connection to air flow control actuator
connector at “BRN/WHT” and “BRN/YEL” wire terminals.
3) If OK, measure voltage between “BRN/WHT” wire terminal of air flow control actuator connector and
vehicle body ground with ignition switch turned ON when
air flow selector is operation to DEF direction.
Is voltage 10 – 14 V? Go to Step 7.
Go to Step 4.

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4Wire harness check
1) Disconnect connector from HVAC control module with
ignition switch turned OFF.
2) Check for proper connection to HVAC control module connector at “G51-1” and “G51-2” terminals.
3) If OK, measure resistance between “BRN/WHT” wire terminal of air flow contro l actuator connector and “G51-
1” terminal of HVAC control module connector.
Is resistance below 5
Ω? Go to Step 5. “BRN/WHT” wire open
or high resistance
circuit.
5 Wire harness check
1) Measure resistance between “BRN/WHT” wire terminal
of air flow control actuator connector and vehicle body
ground.
Is resistance infinity? Go to Step 6.
“BRN/WHT” wire
shorted to ground
circuit.
6 Wire harness check
1) Measure voltage between “BRN/WHT” wire terminal of
air flow control actuator connector and vehicle body
ground with ignition switch turned ON.
Is voltage 0 V? Go to Step 7.
“BRN/WHT” wire
shorted to other circuit.
7 Wire harness check
1) Connect connector to HVAC control module with ignition
switch turned OFF.
2) Measure voltage between “BRN/YEL” wire terminal of air flow control actuator connector and vehicle body ground
with ignition switch turned ON when air flow selector is
operation to FACE direction.
Is voltage 10 – 14 V? Go to Step 11. Go to Step 8.
8 Wire harness check
1) Disconnect connector from HVAC control module with
ignition switch turned OFF.
2) Check for proper connection to HVAC control module connector at “G51-1” and “G51-2” terminals.
3) If OK, measure resistance between “BRN/YEL” wire terminal of air flow contro l actuator connector and “G51-
2” terminal of HVAC control module connector.
Is resistance below 5
Ω? Go to Step 9. “BRN/YEL” wire open or
high resistance circuit.
9 Wire harness check
1) Measure resistance between “BRN/YEL” wire terminal of
air flow control actuator connector and vehicle body
ground.
Is resistance infinity? Go to Step 10. “BRN/YEL” wire shorted
to ground circuit.
10 Wire harness check
1) Measure voltage between “BRN/YEL” wire terminal of air
flow control actuator connector and vehicle body ground
with ignition switch turned ON.
Is voltage 0 V? Go to Step 11. “BRN/YEL” wire shorted
to other circuit.
Step Action Yes No

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DTC B1541: HVAC Control Module Back-Up Power Supply MalfunctionS7RS0B7224017
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Troubleshooting11
Position sensor circuit check
1) Check air flow control actuator position sensor circuit
referring to Step 1 to Step 5 and Step 10 to Step 11 of
“DTC B1512: Air flow Control Actuator (Position Sensor)
and/or Its Circuit Malfunction”.
Is it in good condition? Go to Step 12. Repair circuit.
12 Air flow control actuator check
1) Check air flow control actuator referring to “Air Flow
Control Actuator Inspection”.
Is it in good condition? HVAC control module
faulty.
Air flow control actuator
faulty.
Step Action Yes No
WHT/RED
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1. HVAC control module
2. Junction block assembly 3. Circuit fuse
DTC Detecting Condition Trouble Area
Back-up power supply voltage is lo wer than specified value continuously. • Battery voltage supply circuit
• HVAC control module
StepAction YesNo
1 DTC check
1) Turn ON ignition switch for 20 sec. or more.
2) Ignition switch turned OF F and connect scan tool to
DLC.
3) Turn ON ignition switch and check DTC.
Is there DTC B1541? Go to Step 2.
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
2 Battery voltage supply circuit check
1) Disconnect connector from HVAC control module with
ignition switch turned OFF.
2) Check for proper connection to HVAC control module connector at “G52-16” terminal.
3) If OK, measure voltage between “G52-16” terminal of HVAC control module connector and vehicle body
ground.
Is voltage 10 – 14 V? HVAC control module
faulty.
Circuit fuse blown and/
or “WHT/RED” wire
circuit open or short.

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DTC B1546: A/C Refrigerant Pressure MalfunctionS7RS0B7224018
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
DTC B1551: Serial Communication Circuit MalfunctionS7RS0B7224019
Wiring DiagramDTC detecting condition Trouble area
A/C refrigerant pressure sensor signal voltage is lower t han specified value
even though outside air temperature is higher than specified value for
specified time continuously. • Insufficient of refrigerant
• A/C refrigerant pressure sensor
• Outside air temperature sensor
• HVAC control module
Step
Action YesNo
1 A/C refrigerant pressure and outside air temperature
check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Start engine and select “DATA LIST” mode on scan tool.
3) Check “Refrigerant Pressure” and “Outside Air Temp” varies displayed on scan tool.
Is displayed each va ries described varies in “Scan Tool
Data”? Go to Step 2.
Check the amount of
refrigerant and system
for leaks.
2 A/C system performance check
1) Check A/C system performance referring to “A/C System
Performance Inspection”.
Is check result satisfactory? Go to Step 3.
Repair or replace
defective part.
3 A/C refrigerant pressure sensor check
1) Check A/C refrigerant pressure sensor referring to “A/C
Refrigerant Pressure Sensor and Its Circuit Inspection”.
Is check result satisfactory? Go to Step 4.
A/C refrigerant pressure
sensor faulty.
4 Outside air temperature sensor check
1) Check outside air temperature sensor referring to
“Information Display (Clock) Removal and Installation in
Section 9C”.
Is check result satisfactory? HVAC control module
faulty.
Outside air temperature
sensor faulty.
YEL17812910
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G51-7
12V
2
3
G37-11
I5RS0A722016-01
1. HVAC control module 2. BCM3. Information display

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DTC Detecting Condition and Trouble Area
DTC Troubleshooting
DTC B1552: Serial Communication Signal MalfunctionS7RS0B7224020
DTC Detecting Condition and Trouble AreaDTC detecting condition Trouble area
Serial communication signal is higher than or lower than specified value for
specified time continuously. • Serial communication line of BCM
• BCM (included in junction block
assembly)
• Information display
• HVAC control module
Step Action YesNo
1 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Disconnect connector from information display.
3) Turn ignition switch ON and check DTC.
Is there DTC B1551? Go to Step 2.
Information display
faulty.
2 Wire harness check
1) Disconnect connectors from BCM and HVAC control
module.
2) Measure resistance between “G37-11” terminal of BCM connector and “G51-7” terminal of HVAC control module
connector.
Is resistance below 5
Ω? Go to Step 3. “YEL” wire open or high
resistance circuit.
3 Wire harness check
1) Measure resistance between “G51-7” terminal of HVAC
control module connector and vehicle body ground.
Is resistance infinity? Go to Step 4. “YEL” wire shorted to
ground circuit.
4 Wire harness check
1) Measure voltage between “G51-7” terminal of HVAC
control module connector and vehicle body ground with
ignition switch turned ON.
Is voltage 0 V? Go to Step 5. “YEL” wire shorted to
other circuit.
5 Serial communication signal check
1) Connect connectors to BCM and HVAC control module.
2) Using oscilloscope, check that serial communication
signal is outputted referring to “Reference waveform
No.8” of “Inspection of BCM and its Circuits in Section
10B”.
Is serial communication signal outputted at “G37-11”
terminal of BCM connector? HVAC control module
faulty.
BCM (included in
junction block
assembly) faulty.
DTC detecting condition
Trouble area
Data received by HVAC control module from BCM is erroneous continuously. • BCM (included in junction block assembly)
• HVAC control module

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DTC Troubleshooting
DTC B1553: CAN Communication Signal MalfunctionS7RS0B7224021
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
DTC B1557: Vehicle Speed Sensor Signal MalfunctionS7RS0B7224022
DTC Detecting Condition and Trouble Area
DTC TroubleshootingStep Action Yes No
1 Serial communication signal data check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Start engine and select “DATA LIST” mode on scan tool.
3) Check “Refrigerant Pressure”, “Vehicle Speed”, “Coolant Temp” and “Outside Air Temp” varies displayed on scan
tool.
Is displayed each va ries described varies in “Scan Tool
Data”? Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
Go to Step 2.
2 Serial communication signal check
1) Connect connectors to BCM and HVAC control module.
2) Using oscilloscope, check that serial communication
signal is outputted referring to “Reference waveform
No.8” of “Inspection of BCM and its Circuits in Section
10B”.
Is serial communication signal outputted at “G37-11”
terminal of BCM connector? HVAC control module
faulty.
BCM (included in
junction block
assembly) faulty.
DTC detecting condition
Trouble area
HVAC control module receives error code fr om BCM continuously.• CAN communication circuit
• BCM (included in junction block assembly)
•ECM
• HVAC control module
Step Action YesNo
1 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check ECM and BCM for DTC.
Is there DTC(s)? Go to applicable DTC
diag. flow.
Substitute a known-
good HVAC control
module and recheck.
DTC detecting condition
Trouble area
HVAC control module receives error code from BCM continuously. • VSS circuit
• VSS
• HVAC control module
Step Action YesNo
1 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check ECM for DTC.
Is there DTC P0500? Go to “DTC P0480: Fan
1 (Radiator Cooling
Fan) Control Circuit in
Section 1A”.
Substitute a known-
good HVAC control
module and recheck.

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DTC B1561: Engine Coolant Temperature Sensor Signal MalfunctionS7RS0B7224023
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
DTC B1562: Outside Air Temperature Sensor Signal MalfunctionS7RS0B7224024
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
DTC B1563: A/C Refrigerant Pressure Sensor Signal MalfunctionS7RS0B7224025
DTC Detecting Condition and Trouble Area
DTC TroubleshootingDTC detecting condition Trouble area
HVAC control module receives error code from BCM continuously. • ECT sensor circuit
• ECT sensor
• HVAC control module
StepAction YesNo
1 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check ECM for DTC.
Are there DTC P0116, P0117 or P0118? Go to applicable DTC
diag. flow.
Substitute a known-
good HVAC control
module and recheck.
DTC detecting condition
Trouble area
HVAC control module receives er ror code from BCM continuously. • Outside air temperature sensor
circuit
• Outside air temperature sensor
• HVAC control module
Step Action YesNo
1 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check BCM for DTC.
Are there DTC B1141, B1142 or B1143? Go to applicable DTC
diag. flow.
Substitute a known-
good HVAC control
module and recheck.
DTC detecting condition
Trouble area
HVAC control module receives er ror code from BCM continuously. • A/C refrigerant pressure sensor
circuit
• A/C refrigerant pressure sensor
• HVAC control module
Step Action YesNo
1 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check ECM for DTC.
Are there DTC P0532 or P0533? Go to applicable DTC
diag. flow.
Substitute a known-
good HVAC control
module and recheck.

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Inspection of HVAC Control Module and Its CircuitS7RS0B7224026
HVAC control module and its circuits can be checked at HVAC control module wiring couplers by measuring voltage.
CAUTION!
HVAC control module can not be checked by itself. It is strictly prohibited to connect voltmeter to
HVAC control module with couplers disconnected from it.

Voltage Check
1) Remove HVAC control module referring to “HVAC Control Module Removal and Installation”.
2) 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 ignition
switch is ON.

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1. HVAC control module2. HVAC control module connector (viewed from harness side)
Terminal Wire Color CircuitNormal
Vo l ta g e Condition
G51-1 BRN/WHT Air flow control actuator
(DEF) 10 – 14 V
Ignition switch turned ON, ai
r flow control actuator is
working in operation fr om VENT to DEF position
0 – 1 V Ignition switch turned ON, except the above condition
G51-2 BRN/YEL Air flow control actuator
(FACE) 10 – 14 V
Ignition switch turned ON, ai
r flow control actuator is
working in operation fr om DEF to VENT position
0 – 1 V Ignition switch turned ON, except the above condition
G51-3 GRY/BLU Temperature control
actuator (COOL) 10 – 14 VIgnition switch turned ON, temperature control
actuator is working in ope
ration from HOT to COOL
position
0 – 1 V Ignition switch turned ON, except the above condition
G51-4 GRY/RED Temperature control
actuator (HOT) 10 – 14 VIgnition switch turned ON, temperature control
actuator is working in operation from COOL to HOT
position
0 – 1 V Ignition switch turned ON, except the above condition
G51-5 PPL/WHT Serial communication line
of data link connector 10 – 14 V Ignition switch turned ON
G51-6 — — — —
G51-7 YEL Serial communication line
of BCM Refer to “Inspection of BCM a
nd its Circuits in Section 10B”

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Terminal Wire Color CircuitNormal
Vo l ta g e Condition
G52-1 WHT Output of 5 V power
source for air flow control
actuator position sensor
and temperature control
actuator position sensor 4 – 6 V Ignition switch turned ON
G52-2 PNK Output of 5 V power
source for sunload sensor 4 – 6 V Ignition switch turned ON
G52-3 ORN Ground for sensors Below 0.3 V Ignition switch turned ON
G52-4 WHT/BLK Evaporator temperature
sensor signal 3.45 – 3.65 V
Ignition switch turned ON, evaporator temperature 0
°
C (32 °F)
2.55 – 2.85 V Ignition switch turned ON, evaporator temperature
15
°C (59 ° F)
1.7 – 2.1 V Ignition switch turned ON, evaporator temperature
30
°C (86 ° F)
G52-5 YEL/BLK Sunload sensor signal
G52-6 PNK/BLK Inside air temperature
sensor signal About 2.0 V
Ignition switch turned ON, room temperature 25
°C
(77 °F)
About 2.8 V Ignition switch turned ON, room temperature 0
°C
(32 °F)
G52-7 — — — —
G52-8 RED/BLK Electric power source 10 – 14 V Ignition switch turned ON
G52-9 — — — —
G52-10 — — — —
G52-11 BLK/ORN Ground for HVAC control
module Below 0.3 V Ignition
switch turned ON
G52-12 — — — —
G52-13 YEL Temperature control
actuator position sensor
signal About 4.0 V
Ignition switch turned ON, temperature selector MAX
COOL position
About 2.0 V Ignition switch turned ON, temperature selector MAX
HOT position
G52-14 WHT/BLU Air flow control actuator
position sensor signal About 4.0 V
Ignition switch turned ON
, air flow selector VENT
position
About 1.6 V Ignition switch ON, air flow selector DEF position
G52-15 — — — —
G52-16 WHT/RED Electric power source for
back-up 10 – 14 V Full-time