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DTC 12, 14, or 17

DTC 12, 14, or 17

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 Descriptors

DTC 12

Parking Heater Overheating - Software

DTC 14

Parking Heater Possible Overheating Detected

DTC 17

Parking Heater Overheating Detected - Hardware

Circuit/System Description

The parking heater controller is connected to the vehicle power supply through the parking heater fuses.

Conditions for Running the DTC

Battery voltage must be between 10-15 V.

Conditions for Setting the DTC

12

The parking heater controller detects temperature greater than 125°C (257°F) at the overheat temperature sensor for at least 20 s without interruption.

14

The parking heater controller detects a temperature differential of 25°C (45°F) between the overheat temperature sensor and inside air temperature sensors.

17

The parking heater controller detects temperature greater than 130°C (266°F) at the overheat temperature sensor.

Action Taken When the DTC Sets

The parking heater will lock.

Conditions for Clearing the DTC

DTC must be cleared with the remote control.

Diagnostic Aids

Check for proper operation of the heater coolant pump and water flow through the engine cooling system.

Reference Information

Schematic Reference

HVAC Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Fuel Operated Heater Description and Operation

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Circuit/System Verification

Ignition OFF, command the parking heater ON and OFF with the remote control. Verify the parking heater turns ON and OFF with no DTCs.

Circuit/System Testing


1. Ignition OFF, separate the K87 Parking Heater Control Module from the X150 Parking Heater Harness & Parking Heater Assembly Harness.

2. Test the B168 Parking Heater Coolant Temperature Sensor by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the Sensor Resistance Table and verify that the resistance is within 5% of the specification.

3. If not within the specified range, replace the B168 Parking Heater Coolant Temperature Sensor.

4. Test the B169 Parking Heater Overheat Sensor by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the Sensor Resistance Table and verify that the resistance is within 5% of the specification.

5. If not within the specified range, replace the B169 Parking Heater Overheat Sensor.

6. If all circuits test normal, test or replace the K87 Parking Heater Control Module.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.