Diagnostic Instructions
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 control 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
Conditions for Setting the DTC
B1024 53
The module senses an internal temperature less than -40ºC (-40ºF).
B1024 54
The module senses an internal temperature greater than 69ºC (156ºF).
Action Taken When the DTC Sets
Conditions for Clearing the DTC
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 Wiring Schematics (IOB) , Radio/Navigation System Wiring Schematics (IOR) or Radio/Navigation System Wiring Schematics (IO5/IO6) , or Radio/Navigation System Wiring Schematics (IOS/IOT).
Connector End View Reference
Component Connector End View Index
Description and Operation
Radio/Audio System Description and Operation (IO6) , Radio/Audio System Description and Operation (IOB) , or Radio/Audio System Description and Operation (IOS/IOT/IOU).
Electrical Information Reference
Scan Tool Reference
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.
The system is operating as designed, All OK.
2. Using the scan tool, clear the DTC.
3. Verify the DTC does not set while operating the infotainment system under the conditions the customer experienced the concern.
Replace the K74 Human Machine Interface Control Module
4. All OK.
Repair Instructions
Refer to Control Module References for human machine interface control module replacement, programming, and setup.
Perform the Diagnostic Repair Verification after completing the repair.
DTC B1024 (Radio)
Diagnostic Instructions
DTC Descriptor
DTC B1024
Circuit Board Temperature Sensor
Symptom Byte Information: Symptom Byte List.
Circuit/System Description
The internal module circuitry temperature is monitored. If the an over-heat condition which exceeds the maximum threshold of the internal circuitry or a malfunctioning temperature sensor is detected, the module will shut down until the internal circuitry cools.
Conditions for Running the DTC
Conditions for Setting the DTC
The module detects an over-heat condition or a malfunctioning sensor.
Action Taken When the DTC Sets
Module functionality is suspended.
Conditions for Clearing the DTC
Diagnostic Aids
Extended use of extremely high volume, especially in warm weather conditions, may cause this DTC to set in the Control module. Under these conditions, it may be normal for this DTC to set to prevent permanent damage to the Control module circuitry and no repair should be attempted.
Reference Information
Schematic Reference
Radio/Navigation System Wiring Schematics (IOB) , Radio/Navigation System Wiring Schematics (IOR) or Radio/Navigation System Wiring Schematics (IO5/IO6) , or Radio/Navigation System Wiring Schematics (IOS/IOT).
Connector End View Reference
Component Connector End View Index
Description and Operation
Radio/Audio System Description and Operation (IO6) , Radio/Audio System Description and Operation (IOB) , or Radio/Audio System Description and Operation (IOS/IOT/IOU).
Electrical Information Reference
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.
The system is operating as designed, All OK.
2. Using the scan tool, clear the DTC.
3. Verify the DTC does not set while operating the infotainment system under the conditions the customer experienced the concern.
Replace the appropriate module.
4. All OK.
Repair Instructions
Refer to Control Module References for Control module replacement, setup, and programming.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.