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DTC 41 or 42

DTC 41 or 42

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 41

Parking Heater Water Pump Circuit Open

DTC 42

Parking Heater Water Pump Circuit Low or Circuit High

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Parking Heater Water Pump Supply Voltage

42

41

42

-

Parking Heater Water Pump Ground

-

41

42

-



Circuit/System Description

The parking heater uses the parking heater water pump motor to circulate coolant while the engine is not running.

Conditions for Running the DTC

Ignition OFF. Battery voltage must be between 10-15 V.

Conditions for Setting the DTC

parking heater has recognized out of range condition for more than 2.5 s.

Action Taken When the DTC Sets

The parking heater will lock.

Conditions for Clearing the DTC

DTC must be cleared with the remote control.

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 coolant pump turns ON and OFF with the heater.

Circuit/System Testing


1. Ignition OFF, parking heater OFF, disconnect the G17 Heater Coolant Pump.

2. Ignition OFF, test for less than 5 Ω between the low reference circuit terminal B and ground.

3. If greater than the specified range, replace the K87 Parking Heater Control Module.

4. Install a test lamp between the control circuit terminal A and low reference circuit terminal B.

5. Command the parking heater ON and OFF using the remote control. Verify the test lamp turns ON and OFF with each command.

6. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K87 Parking Heater Control Module.

7. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K87 Parking Heater Control Module.

8. If all circuits test normal, test or replace the G17 Heater Coolant Pump.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.