Circuit Description
The body control module (BCM) monitors the condition of the load B+ supply circuits. When the BCM has 9-16 volts from the CLSTR/BCM fuse, the BCM tests to verify voltage and grounds are present for the BCM outputs.
The battery feed circuit, from the HTD SEAT fuse, provides power for the following items:
| • | Heated seats |
| • | RAP Relay coil |
| • | Rear Defogger Relay coil |
The battery feed circuit, from the DR LK fuse to the BCM, provides power for the following items:
| • | Door locks |
| • | Trunk release motor |
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1339 Device Power 3 (high current 1) Circuit Open
Conditions for Running the DTC
The voltage on the battery feed circuit, from the CLSTR/BCM fuse to the BCM must be between 9-16 volts.
Conditions for Setting the DTC
The BCM must detect:
| • | the B+ supply circuit for load and RAP functions is less than 1 volt |
| • | the B+ supply circuit for the lock and trunk release functions is less than 1 volt |
| • | the above conditions last for more than 300 milliseconds |
Action Taken When the DTC Sets
| • | The lock and release functions may not operate. |
| • | The defrost functions for the rear window and the exterior mirrors may not operate. |
| • | The heated seats may not operate. |
| • | The BCM stores DTC B1339 in memory. |
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. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Body Control System Schematics Connector End View Reference: Computer/Integrating Systems Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the scan tool display Active for both parameters? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Test the battery circuit that does not display Active in the previous step for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 6 | Go to Step 4 |
4 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 6 | Go to Step 5 |
5 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the repair? | Go to Step 6 | -- |
6 |
Does the DTC reset? | Go to Step 2 | System OK |
