B1451

DTC B1451

Circuit Description

The body control module (BCM) provides an accessory voltage output, enabled in Run and Accessory power modes. The accessory voltage circuit provides power for engine control module (ECM), transmission control module (TCM), and wiper run/acc relay.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1451 Accessory Power Circuit






Conditions for Running the DTC

Voltage supplied to the module is in the normal operating voltage range of 9-16 volts.

Conditions for Setting the DTC

B1451 02
* The BCM detects a short to ground in the accessory power circuit when the output is active.
* The condition above must be present for more than 5 seconds.

B1451 05
* The BCM detects a short to battery or an open in the accessory power circuit when the output is inactive.
* The condition above must be present for more than 1 second.

Action Taken When the DTC Sets

B1451 02

The BCM will disable the accessory power output until the next ignition cycle.

Conditions for Clearing the DTC

* A current DTC clears when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.

Diagnostic Aids

If the DTC B1451 02 or B1451 05 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics

The following conditions may cause DTC to occur:

* A short to ground, a short to battery or an open in the accessory power circuit.
* A fault in one of the following modules that shorts the circuit to ground or battery:

- ECM
- TCM

* An internal wiper run/acc relay fault.
* An internal BCM fault.

TEST

Step 1 - Step 11:

Step 12 - Step 15: