For 1990-2009 cars

### 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 B0525: Right Turn Signal Circuit

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Turn Signal/Multifunction Switch Signal | 2 | 2 | 2 | --
Left Turn Indicator Supply Voltage | B0530 00 | 1 | 1 | --
Right Turn Indicator Supply Voltage | B0525 00 | 1 | 1 | --
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 | -- | --

1. Turn Signal Malfunction
2. Turn Signal Switch Malfunction

### 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

When the BCM receives a right turn signal command and the right turn signal indicator supply voltage circuit is open, shorted to ground, or shorted to voltage

### Action Taken When the DTC Sets

The right turn signal indicator in the IPC 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

Exterior Lights Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Exterior Lighting Systems Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the IPC.
2. Verify a test lamp illuminates between the ground circuit terminal 4 and ground.

⇒ | If the test lamp does not illuminate test the ground circuit for an open/high resistance.

3. Connect a test lamp between the control circuit terminal 7 and the ground circuit terminal 4.
4. Ignition ON, operate the right turn signal and verify that the test lamp flashes.

⇒ | 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.

5. If all circuits test normal, test or replace the IPC.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM or IPC replacement, programming, and setup.