Suzuki Grand Vitara JB627. Manual - part 417

10B-17 Body Electrical Control System: 

DTC B1133 (No. 1133): Battery Voltage Too High

S6JB0BA204008

Wiring Diagram
Refer to “BCM Power Circuit and Ground Circuit Check”.

DTC Detecting Condition and Possible cause

Flow Test Description
Step 1: Check charging system

DTC troubleshooting

4

Ground circuit check
1) Turn ignition switch to OFF position.
2) Check for proper connection to BCM connector at 

terminals “G30-12” and “G32-1”.

3) If OK, then measure resistance between following 

terminals.
• Between “G30-12” terminal of BCM connector and 

vehicle body ground

• Between “G32-1” terminal of BCM connector and 

vehicle body ground

Is each resistance 2 

Ω

 or less?

BCM power supply 
circuit and ground circuit 
are in good condition.

Repair ground circuit.

Step

Action

Yes

No

DTC detecting condition

Possible cause

Power voltage supplied from battery to BCM is higher 
than 16V.

• Charging system malfunction
• BCM malfunction

Step

Action

Yes

No

1

Charging system operation check
1) Check generator for operation referring to “Generator 

Test (Overcharged Battery Check) in Section 1J”.

Is it in good condition?

Substitute a known-
good BCM and recheck.

Repair charging system.

Body Electrical Control System:  10B-18

DTC B1141 / B1142 (No. 1141 / No. 1142): Outside Air Temperature (Ambient Temp.) Sensor Circuit 
Malfunction

S6JB0BA204009

Wiring Diagram

DTC Detecting Condition and Possible Cause

Flow Test Description
Step 1: Check whether malfunction is in outside air temperature sensor.
Step 2: Check outside air temperature sensor circuit.

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2

1

G32

24

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G30

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G31

WHT/BLK

BLK/RED

5V

G31-24

G31-21

1

2

2

3

1

I5JB0AA20007-01

1. Outside air temperature sensor

3. Outside air temperature sensor connector

2. BCM

DTC detecting condition

Possible cause

DTC B1141 (DTC No. 1141):
Input signal from outside air temperature sensor is higher 
than 4.88 V.

• Open in outside air temperature sensor circuit
• Outside air temperature sensor malfunction
• BCM malfunction

DTC B1142 (DTC No. 1142):
Input signal from outside air temperature sensor is lower 
than 0.1 V.

• Short in outside air temperature sensor circuit
• Outside air temperature sensor malfunction
• BCM malfunction

10B-19 Body Electrical Control System: 

DTC troubleshooting

DTC B1150 (No. 1150): Air Bag Communication Circuit Malfunction

S6JB0BA204010

Wiring Diagram

DTC Detecting Condition and Possible Cause

Step

Action

Yes

No

1

Check outside air temperature sensor
1) Turn ignition switch to OFF position.
2) Disconnect connector from outside air temperature 

sensor.

3) Check outside air temperature sensor for resistance 

referring to “Outside Air Temperature Sensor Inspection 
(If Equipped) in Section 9C”.

Is it in good condition?

Go to Step 2.

Replace outside air 
temperature sensor.

2

Outside air temperature sensor circuit check
1) Disconnect connector from BCM and check for proper 

terminal connection to BCM connector.

2) If connections are OK, check outside air temperature 

sensor circuit for open, short and high resistance.

Is each circuit in good condition?

Substitute a known-
good BCM and recheck.

Repair circuit.

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G32

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G30

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G31

YEL

5V

G30-19

[A]: G47-22
[B]: G46-15

[A]

[B]

2

1

1

1

G46

G47

I5JB0AA20008-01

[A]: Vehicle not equipped with side-air bag

1. SDM

[B]: Vehicle equipped with side-air bag

2. BCM

DTC detecting condition

Possible cause

After ignition switch is turned on, abnormal signal is fed 
from SDM to BCM.

• Air bag communication circuit open or short
• SDM malfunction
• BCM malfunction

Body Electrical Control System:  10B-20

Flow Test Description
Step 1: Check air bag communication circuit.
Step 2: Check air bag communication circuit.

DTC Troubleshooting

DTC B1157 (No. 1157): Air Bag Deployment Signal Input

S6JB0BA204011

Wiring Diagram
Refer to “DTC B1150 (No. 1150): Air Bag Communication Circuit Malfunction”.

DTC Detecting Condition and Possible cause

Flow Test Description
Step 1: Check DTC for SDM.

DTC troubleshooting

DTC B1170 (No. 1170): EEPROM access error

S6JB0BA204012

DTC Detecting Condition and Possible Cause

DTC Troubleshooting

NOTE
Before performing steps below, be sure to perform “Body Electrical Control System Check”.

 

1) Ignition switch OFF.
2) Replace BCM.

Step

Action

Yes

No

1

Air bag communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connector from SDM referring to “SDM 

Removal and Installation in Section 8B”.

3) Disconnect connector from BCM.
4) Check air bag communication circuit for open, short and 

high resistance.

Is circuit in good condition?

Go to Step 2.

Repair circuit.

2

Air bag communication circuit check
1) Turn ignition switch to OFF position.
2) Connect connectors to BCM.
3) Turn ignition switch to ON position.
4) Measure voltage between “G30-19” terminal of BCM 

connector and vehicle body ground.

Is voltage 4 – 6 V?

Substitute a known-
good SDM and recheck.

Substitute a known-
good BCM and recheck.

DTC detecting condition

Possible cause

Air bag deployment signal is fed from SDM to BCM.

• Air bag component parts
• BCM malfunction

Step

Action

Yes

No

1

Check DTC for SDM
1) Check DTC stored in SDM referring to “DTC Check in 

Section 8B”.

Is DTC B1021 detected?

Go to “DTC B1021: Air 
Bag Module Deployed 
in Section 8B”.

Substitute a known-
good BCM and recheck.

DTC detecting condition

Possible cause

Data write error or check sum error.

BCM malfunction