Diagnostic Routine W

Diagnostic Routine W

Diagnostic Overview

U0140:00

Normal Operation and Fault Conditions

DTC Fault Trigger Conditions

Pinpoint Test

1. VERIFY THE CUSTOMER CONCERN

1. Ignition ON.

2. Verify there is an observable symptom present.

Is an observable symptom present?

2. CHECK FOR LOST COMMUNICATION DTCs (Diagnostic Trouble Codes)

1. Ignition ON.

2. Using a scan tool, clear continuous memory DTCs (Diagnostic Trouble Codes) from all modules.

3. Ignition OFF.

4. Wait at least 10 seconds.

5. Ignition ON.

6. Using a scan tool, retrieve all continuous memory DTCs (Diagnostic Trouble Codes) from all modules.

Is DTC (Diagnostic Trouble Code) U0140:00 set in any audio system module?

3. CHECK THE BCM (Body Control Module) FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs (Diagnostic Trouble Codes)

1. Using a scan tool, perform the BCM (Body Control Module) self-test.

Are any low or high voltage DTCs (Diagnostic Trouble Codes) recorded in the BCM (Body Control Module)?

4. CHECK THE AUDIO SYSTEM MODULES FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs (Diagnostic Trouble Codes)

1. Using a scan tool, perform the APIM (Accessory Protocol Interface Module) and the GPSM (Global Positioning System Module) self-tests.

Are any low or high voltage DTCs (Diagnostic Trouble Codes) recorded in either module?

5. CHECK FOR DTC (Diagnostic Trouble Code) U0140:00 SET IN MULTIPLE MODULES

1. Review the recorded results from the self-test.

Is DTC (Diagnostic Trouble Code) U0140:00 set in more than one module?

6. CHECK FOR CORRECT BCM (Body Control Module) OPERATION

1. Disconnect and inspect all BCM (Body Control Module) connectors.

2. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

3. Reconnect the BCM (Body Control Module) connectors. Make sure they seat and latch correctly.

4. Operate the system and determine if the concern is still present.

Is the concern still present?