B3143

DTC B3142 or B3143

Circuit Description

The body control module (BCM) provides an output to the driver switch assembly through the door unlock control circuit for controlling automatic door unlock, anti-lockout, and keyless entry unlock functions.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

* DTC B3142 Unlock Switch Circuit Low
* DTC B3143 Unlock Switch Circuit High

Conditions for Setting the DTC

* The BCM detects a short to ground on the door unlock control circuit for greater than 60 seconds.
* The BCM detects a short to battery on the door unlock control circuit for greater than 1 second.

Action Taken When the DTC Sets

* The BCM stores DTC B3142 or B3143 in memory.
* The BCM will disable the output and all operations of the output until the fault no longer exists.

Conditions for Clearing the DTC

* The BCM no longer detects the short to ground on the door unlock control circuit for greater than 60 seconds.
* The BCM no longer detects the short to battery on the door unlock control circuit for greater than 1 second.
* 100 consecutive ignition cycles have been recorded without the DTC being detected.

Diagnostic Aids

If DTC B3142 or B3143 are history DTCs, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics

Test Description

Step 1 - Step 8:

The numbers below refer to the step numbers on the diagnostic table.
2. This step determines whether the key cylinder switch is shorted.
3. This step determines whether the driver switch assembly is shorted.