Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B0527 00: Right Turn Signal Circuit LowDTC B0528 00: Right Turn Signal Circuit High
DTC B0529 00: Right Turn Signal Circuit Open
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Left Turn Indicator Supply Voltage | B0525 00 | 1 | 1 | -- |
Right Turn Indicator Supply Voltage | B0530 00 | 1 | 1 | -- |
Turn Signal/Multifunction Switch Signal | 2 | 2 | 2 | -- |
Left Turn Signal Control | B0532 00 | B0534 00 | B0533 00 | -- |
Right Turn Signal Control | B0527 00 | B0529 00 | B0528 00 | -- |
Front Park/Turn Signal Lamps Ground | -- | 1 | -- | -- |
Rear Park/Turn Signal Lamp Ground | -- | 1 | -- | -- |
Turn Signal/Multifunction Switch Ground | -- | 2 | -- | -- |
| ||||
Circuit/System Description
Ground is applied at all times at G106 to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the ON or START position. When the turn signal/multifunction switch is placed in either the TURN RIGHT or TURN LEFT position, ground is applied to the body control module (BCM) through either the right turn or left turn signal switch signal circuit. The BCM then applies a pulsating voltage to the front and rear turn signal lamps through there respective voltage supply circuits. When a turn signal request is received by the BCM, a serial data message is sent to the instrument panel cluster (IPC) requesting the respective turn signal indicator be pulsed ON and OFF.
Conditions for Running the DTC
The battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
B0527
When the BCM receives a right turn signal command and the right front or rear turn lamp control circuit is shorted to ground.
B0528
When the BCM receives a right turn signal command and the right front or rear turn lamp control circuit is shorted to voltage.
B0529
When the BCM receives a right turn signal command and the right front or rear turn lamp control circuit is open.
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 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. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the inoperative right turn signal lamp.
- Verify a test lamp illuminates between the ground circuit terminal G and B+.
- Connect a test lamp between the control circuit terminal A and the ground circuit terminal G.
- Ignition ON, command the inoperative turn signal lamp ON and OFF with a scan tool. The test lamp should turn ON and OFF.
- If all circuits test normal, test or replace the inoperative lamp.
| ⇒ | If the test lamp does not illuminate test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, programming, and setup. |
