GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2007 🢒 Colorado Pickup - 2WD 🢒 Brakes 🢒 Park Brake 🢒 DTC B0527, B0528, or B0529

Circuit Description

When the body control module (BCM) receives a right turn signal ON command from the turn signal switch, the BCM will apply voltage to the right rear stop/turn lamp supply voltage circuit and right turn signal lamps supply voltage circuit. The turn signal flasher is integrated within the BCM and will flash both circuits simultaneously. The turn signal indicator is also illuminated utilizing the right rear stop/turn lamp supply voltage circuit.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

    • DTC B0527 Right Turn Signal Circuit Low
    • DTC B0528 Right Turn Signal Circuit High
    • DTC B0529 Right Turn Signal Circuit Open

Conditions for Running the DTC

The battery voltage must be between 9-16 volts.

Conditions for Setting the DTC
    • When the BCM receives a right turn signal command and the right rear stop/turn lamp supply voltage circuit is open, shorted to ground, or shorted to voltage
    • When the BCM receives a right turn signal command and the right turn signal lamps supply voltage circuit is shorted to ground or shorted to voltage

Action Taken When the DTC Sets

The right front and/or right rear turn signals will not operate or will remain always ON.

Conditions for Clearing the MIL/DTC
    • This DTC will clear on current status after the condition for setting the fault is corrected.
    • A history DTC will clear after 100 consecutive ignition cycles without a fault present.
    • History and current DTCs can be cleared using a scan tool.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step tests for supply voltage and ground at the inoperative bulb socket.

    2.

  2. This step tests if battery positive voltage is constantly being applied to the supply voltage circuit.

    3.

  3. This step tests if a condition exists in the supply voltage circuit.

    4.

  4. This step tests if a condition exists in the ground circuit.

    5.

  5. After replacement of the instrument panel cluster (IPC), you must calibrate the new cluster for proper operation.

    6.

  6. After replacement of the BCM, you must calibrate the new module for proper operation.

Step

Action

Yes

No

Schematic Reference: Fog Lights Schematics

Connector End View Reference: Lighting Systems Connector End Views , Displays and Gages Connector End Views , or Data Communication Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the inoperative turn signal ON and OFF.

Does the inoperative turn signal operate ON and OFF with each command?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Remove the inoperative bulb. Refer to Park/Turn Signal/Side Marker Lamp Bulb Replacement , Tail Lamp Bulb Replacement , or Instrument Cluster Replacement .
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between the ground circuit and the supply voltage circuit of the inoperative bulb socket.
  5. With a scan tool, command the inoperative turn signal ON and OFF.

Does the test lamp illuminate?

Go to Step 4

Go to Step 5

4

Does the test lamp remain illuminated with each command?

Go to Step 7

Go to Step 8

5

Test for a short to ground, open, or high resistance in the supply voltage circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 15

Go to Step 6

6

Test for an open or high resistance in the ground circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 15

Go to Step 11

7

Test the supply voltage circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 15

Go to Step 11

8

Does the condition only exist with the turn signal indicator in the instrument panel cluster (IPC)?

Go to Step 9

Go to Step 10

9

Inspect for poor connections at the IPC. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 15

Go to Step 12

10

Inspect for poor connections at the inoperative bulb socket. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 15

Go to Step 13

11

Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 15

Go to Step 14

12

Replace the IPC. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 15

--

13

Replace the inoperative bulb. Refer to Park/Turn Signal/Side Marker Lamp Bulb Replacement or Tail Lamp Bulb Replacement .

Did you complete the replacement?

Go to Step 15

--

14

Replace the BCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 15

--

15
  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