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 B1023 00: Integral Switch Performance

### Circuit/System Description

The radio monitors the button presses on the radio display. The radio will ignore any stuck buttons and allow full functionality of the working buttons. The only circuit required is the serial data line between the radio and the radio display.

### Conditions for Running DTC

• | System voltage is between 9-16 volts.

• | Ignition switch is in the ON position.

### Conditions for Setting DTC

This DTC is generated by the radio if a button is active for a period greater than 60 seconds.

### Action Taken When DTC Sets

• | The radio ignores continuous inputs from the button.

• | The radio will respond to all other valid button inputs.

### Conditions for Clearing the DTC

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

• | The history DTC will clear after 50 fault-free ignition cycles.

### Reference Information

#### Schematic Reference

Radio/Navigation System Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Radio/Audio System 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 Verification

1. Inspect the radio display buttons for signs of damage or foreign objects. Operate each of the radio display buttons and verify that the buttons have a smooth operation.

⇒ | If the buttons do not have a smooth operation, replace the radio display.

2. Verify DTC 1023 is not set.

⇒ | If the DTC is set, clear the DTC. If the DTC resets, replace the driver information display.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for Radio Display and Radio replacement, setup, and programming