Suzuki Grand Vitara Service Manual page 97

[A]: Keyless start control module connector (if equipped) (viewed from harness side)
[B]: ECM connector (viewed from harness side)
[C]: TCM connector (for A/T model) (viewed from harness side)
[D]: ABS hydraulic unit/control module connector (viewed from terminal side)
[E]: Combination meter connector (viewed from harness side)
[F]: 4WD control module connector (viewed from harness side)
[G]: BCM connector (viewed from harness side)
[H]: DLC (viewed from harness side)
DTC Detecting Condition and Trouble Area
DTC detecting condition
Transmission error of communication data for 4WD control
module is detected more than 7 times at more than specified
error counts continuously.
DTC Confirmation Procedure
1) Clear DTC using scan tool.
2) Start engine and run it for 1 min. or more.
3) Stop vehicle and check DTC.
Troubleshooting
Step
1 Was "4WD control system check" performed?
2 Control module connector check
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Recheck DTC in TCM.
Is DTC U1073 detected?
3 CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of all control modules
communicating by means of CAN.
3) Check CAN communication circuit between control
modules for open, short and high resistance.
Is each CAN communication circuit in good condition?
Transfer: Motor-Shift Type (Transfer with Shift Actuator) 3C-45
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Action
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1. BCM
2. 4WD control module
3. TCM (for A/T model)
4. Keyless start control module (if equipped)
5. ECM
6. ABS hydraulic unit / control module
7. Combination meter
8. DLC
Trouble area
• CAN communication circuit
• ECM
• BCM
• 4WD control module
• TCM
• Combination meter
• Keyless start control module (if equipped)
• ABS hydraulic unit / control module
Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
No
Go to "4WD Control
System Check: Motor-
Shift Type (Transfer with
Shift Actuator)".
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection: in Section
00".
Repair circuit.