GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Impala 🢒 Vehicle Control Systems 🢒 Computer/Integrating Systems 🢒 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 9.0-16.0 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.

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 SVS indicator.

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

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, monitor the DTC Information for DTC B1507 in the body control module (BCM).

Does the scan tool indicate that DTC B1482 is current?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Test the load control circuit of the BCM for an open, a short to voltage, or a short to ground. 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 replacement?

Go to Step 6

--

6
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK