B1451

DTC B1451

Circuit Description
The BCM provides an accessory voltage output, enabled in Run and Accessory power modes. The accessory voltage circuit provides power for ECM, TCM, and traffic information receiver (TIR) module, if equipped. The accessory voltage circuit also provides power to the Wiper Run/Acc relay.

DTC Descriptors
This diagnostic procedure supports the following DTC:

DTC B1451 Accessory Power Circuit

This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description in Vehicle DTC Information.







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.

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
- TIR, if equipped
^ An internal Wiper Run/Acc relay fault.
^ An internal BCM fault.