12 Volt Over Voltage

12 VOLT OVER VOLTAGE





For a complete wiring diagram refer to diagrams.
^ When Monitored:
Continuously with the ignition on.
^ Set Condition:
The Transfer Case Control Module detects the Fused B+ voltage rises above 16.0 volts for 2 seconds.

Possible Causes

- CHARGING SYSTEM DTCS PRESENT
- TRANSFER CASE CONTROL MODULE

1. CHARGING SYSTEM DTCS PRESENT With the DRBIII read Engine DTCs.

Are there any Charging System related DTCs present?
Yes >>Refer to the symptom list and perform the appropriate diagnostic procedure(s) as necessary.
Perform TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test
No >>Go To 2

2. TRANSFER CASE CONTROL MODULE
Using the schematics as a guide, inspect the wiring and connectors. Pay particular attention to all power and ground circuits. Repair as necessary.
If there are no Charging System related DTCs or other possible causes remaining, view repair.

Repair
Replace the Transfer Case Control Module.
Perform TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test