PRE-RELEASE
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.
