Heated Mirrors Malfunction
Heated Mirrors Malfunction
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.
Diagnostic Fault Information
Circuit/System Description
The rear defogger relay supplies voltage to the outside rearview mirror heater elements based on the current state of the rear window defogger. The relay supplies B+ through the driver/passenger mirror heating element control circuit when a request is received.
Reference Information
Schematic Reference
Outside Rearview Mirror Schematics Outside Rearview Mirror Schematics
Connector End View Reference
Component Connector End Views Sunshade - Left
Description and Operation
Outside Mirror Description and Operation Outside Mirror
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
1. Engine running.
2. Verify the E18 Rear Defogger Grid turns ON and OFF when commanding the Rear Defogger On and Off with a scan tool.
• If the E18 Rear Defogger Grid does not turn ON and OFF
Refer to Rear Window Defogger Malfunction Rear Window Defogger Malfunction.
• If the E18 Rear Defogger Grid turns ON and OFF
3. Verify the E17D Outside Rearview Mirror Glass-Driver and the E17P Outside Rearview Mirror Glass-Passenger become warm when commanding the Rear Defogger On with a scan tool.
• If the E17D Outside Rearview Mirror Glass-Driver and the E17P Outside Rearview Mirror Glass-Passenger do not become warm
Refer to Circuit/System Testing.
• If both E17D Outside Rearview Mirror Glass-Driver and the E17P Outside Rearview Mirror Glass-Passenger become warm
4. All OK.
Circuit/System Testing
1. Ignition OFF and all vehicle systems OFF, disconnect the X1 and X2 harness connector at the appropriate E17 Outside Rearview Mirror Glass. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal A X2 and ground.
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Connect a test lamp between the control circuit terminal A X1 and ground.
4. Engine running.
5. Verify the test lamp turns ON and OFF when commanding the Rear Defogger On and Off with a scan tool.
• If the lamp is always ON
1. Ignition OFF, disconnect the X2 harness connector at X50A Fuse Block - Underhood, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, refer to Rear Window Defogger Malfunction Rear Window Defogger Malfunction.
• If the lamp is always OFF
1. Ignition OFF, disconnect the harness connector at X50A Fuse Block - Underhood, ignition ON.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms refer to Rear Window Defogger Malfunction Rear Window Defogger Malfunction.
• If the lamp turns on and off
6. Replace the E17 Outside Rearview Mirror Glass.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
Outside Rearview Mirror Glass Replacement Outside Rearview Mirror Glass Replacement