B1507

DTC B1507 or B1508

Circuit Description

The body control module (BCM) monitors the load control circuit for opens, shorts to ground, and shorts to voltage.

The circuit starts at the BCM and travels to the instrument panel (I/P) fuse panel where the circuit splits to supply power for the heated seat switch and HVAC control head for the rear defog relay driver.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

* DTC B1507 High Power Control Circuit Low
* DTC B1508 High Power Control Circuit High

Conditions for Running the DTC

* This DTC shall run only if the voltage to the BCM is between 9-16 volts.
* The ignition must be in the ON position.
* This DTC shall not set during BCM programing and configuration changes.
* This DTC shall not set if any communication codes are set.

Conditions for Setting the DTC

A DTC B1507 or 1508 will set when the load control circuit does not react as commanded. A DTC B1507 will set if the BCM enables the control circuit and the output does not react within 400 ms. A DTC B1508 will set if the BCM disables the control circuit and the output does not react within 400 ms.





Action Taken When the DTC Sets

The BCM sets a DTC and disables the following DTCs:

* DTC U1096
* DTC U1255
* DTC U1300
* DTC U1301

The BCM illuminates the service vehicle soon (SVS) indicator.

Conditions for Clearing the DTC

Step 1 - Step 6:

* 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.