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 B1529 00: Control Module Voltage Reference Output 5 Circuit

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
BCM B+ Terminal 3 | B1529 00, B3794 08, B3922 00 | B1529 00, B3794 08, B3922 00 | -- | --
BCM B+ Terminal 17 | B1529 00, B3794 08, B3922 00 | B1529 00, B3794 08, B3922 00 | -- | --

### Circuit/System Description

The body control module (BCM) provides battery voltage to the cruise control switch and the automatic transmission shift lever.

### Conditions for Running the DTC

• | The ignition is ON.

• | The battery voltage is between 9 - 16 volts.

### Conditions for Setting the DTC

• | The BCM detects a short to ground or an open on the B+ circuit.

• | The above condition is met for 5 seconds.

### Action Taken When the DTC Sets

The BCM stores the DTC information into memory when the diagnostic runs and fails.

### Conditions for Clearing the DTC

• | The condition for setting the DTC is no longer present.

• | A history DTC clears after 40 fault-free ignition cycles.

### Reference Information

#### Schematic Reference

• | Cruise Control Schematics

• | Body Control System Schematics

• | Automatic Transmission Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Steering Wheel Controls 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 X3 harness connector at the BCM.
2. Verify that a test lamp illuminates between the BCM F9 fuse B+ circuit terminal 3 and ground.

⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

3. Ignition OFF, connect the X3 harness connector at the BCM.
4. Disconnect the harness connector at the turn signal/multifunction switch.
5. Ignition ON, test for B+ between the B+ circuit terminal 6 and ground.

⇒ | If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

6. If all circuits test normal, test or replace the turn signal/multifunction switch.

### Component Testing

1. Ignition OFF, disconnect the harness connector at the steering wheel switch assembly.
2. Test for 0.5-O.L. ohms between the scroll wheel terminals listed below, while rotating each steering wheel scroll wheel several times through its full range of motion.

• | right steering wheel scroll wheel terminal 1 and terminal 2.

• | left steering wheel scroll wheel terminal 3 and terminal 4.

⇒ | If not within the specified range or is erratic, replace the steering wheel switch.

3. Test the resistance between the signal terminal 6 and the low reference terminal 5 while depressing the appropriate steering wheel controls switch button listed below.

⇒ | If not the specified value, replace the steering wheel switch.

Function Switch | Minimum Resistance Value | Maximum Resistance Value
--- | --- | ---
Mute | 98 Ohm | 104 Ohm
Phone/Talk | 247 Ohm | 253 Ohm
Disc Change | 426 Ohm | 434 Ohm
Audio | 646 Ohm | 653 Ohm
Trip | 975 Ohm | 983 Ohm
Call End | 3.73k Ohm | 3.79k Ohm
No Switch Pressed | 7.01k Ohm. | 7.30k Ohm.

### Repair Instructions

Perform the Diagnostic Repair Verification.

Control Module References for BCM replacement, setup, and programming