B1024

DTC B1024

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B1024 53
- Circuit Board Temperature Sensor Below Minimum Threshold

DTC B1024 54
- Circuit Board Temperature Sensor Above Maximum Threshold

Circuit/System Description

The human machine interface module monitors the internal circuitry for excessive temperature. When a temperature outside of the range is detected, the module sets the DTC and limits its operation to avoid damage.

Conditions for Running the DTC

* Ignition is ON or in the ACC position

* The system voltage is 9-16 V

* The test is run once per second when the infotainment system is operating

Conditions for Setting the DTC

B1024 53

The module senses an internal temperature less than -40°C (-40°F).

B1024 54

The module senses an internal temperature greater than 69°C (156°F).

Action Taken When the DTC Sets

* The human machine interface module sets the DTC.

* A message is displayed indicating that the system performance is being impacted by the excessive temperature condition.

* The module stops communicating on the MOST Bus network, but does not interrupt communication on the network.

* The infotainment system and the info display module will have limited or no functionality.

* Components or other subsystems that interface with the infotainment system may have limited or no functionality.

Conditions for Clearing the DTC

* The internal temperature is between -40°C (-40°F) and 69°C (156°F).

* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Diagnostic Aids

Under certain conditions it may be normal for this DTC to set to prevent permanent damage to the module.

Reference Information

Schematic Reference

Radio/Navigation System Schematics Radio/Navigation System Schematics

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Description and Operation

Radio/Audio System Description and Operation Radio/Audio System

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

Note: Allow the vehicle cabin to cool if the temperature inside the vehicle is excessive before proceeding with this diagnostic procedure.

1. Verify the DTC sets outside of the Conditions for Running and Setting. Since most occurrences of this DTC are caused by extreme vehicle cabin temperatures due to ambient conditions, review with the customer the conditions under which the DTC set.

• If the DTC sets within the Conditions for Running and Setting.
The system is operating as designed, All OK.

• If the DTC sets outside the Conditions for Running and Setting.

2. Verify the DTC does not set while operating the infotainment system under the conditions the customer experienced the concern.

• If the DTC sets
Replace the human machine interface module

• If the DTC does not set

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Control Module References Control Module References for human machine interface module replacement, programming, and setup.