For 1990-2009 cars

## DTC B1024 Radio

### 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 B1024 11: Circuit Board Temperature Sensor above maximum threshold

### Circuit/System Description

The internal amplifier circuitry is monitored for temperature. If the amplifier senses an over-heat condition higher than 95[ordm ]C (203[ordm ]F) of the internal circuitry, the amplifier will shut down until the internal circuitry cools below 90[ordm ]C (194[ordm ]F).

### Conditions for Running the DTC

The following are conditions that must be present in order for the radio to enable the diagnostics:

The radio is in ACCESSORY, RUN or RAP power mode.

The ignition voltage is between 9-16 volts.

### Conditions for Setting the DTC

Amplifier senses an over-heat condition higher than 95[ordm ]C (203[ordm ]F) of the internal circuitry.

### Action Taken When the DTC Sets

Amplifier mutes all speaker channels.

### Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

A history DTC clears after 40 malfunction free ignition cycles.

The scan tool clear DTC function is used to clear the DTC.

### Reference Information

#### Schematic Reference

Radio/Audio System Schematics

#### Connector End View Reference

Entertainment/Communication Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

### Circuit/System Testing

The amplifier could operate normally at a reasonably high volume for an extended period of time. Extended use of extremely high volume, especially in warm weather conditions, may induce this DTC. Under these conditions it may be normal for this DTC to set to prevent permanent damage to the amplifier circuitry.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for audio amplifier replacement, setup and programming.

## DTC B1024 TV Module

### 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 B1024: Circuit Board Temperature Sensor Exceeding Limits

### Circuit/System Description

There is a temperature sensor monitoring the internal circuit temperature inside the TV antenna module.

### Conditions for Running the DTC

TV system works.

### Conditions for Setting the DTC

The internal circuit of TV antenna module detects the temperature exceeds the limits.

### Action Taken When the DTC Sets

The TV system does not work when this DTC is present.

### Conditions for Clearing the DTC

• | The conditions for setting the DTC are not present.

• | The history DTC clears after 50 malfunction-free ignition cycles.

• | The scan tool clear DTC function is used to clear the DTC.

### Reference Information

#### Schematic Reference

Radio/Navigation System Schematics

#### Connector End View Reference

Navigation System Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

### Circuit/System Verification

If the TV system is used for an extended length of time, especially under the high temperature, this DTC is present. Under this condition the DTC is set in order to prevent the permanent damages to the TV antenna module, which is normal.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

TV antenna module replacement, refer to TV Antenna Module Replacement