2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 483
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Command the left and right outside mirror to move up, down, left and right using the mirror directional switch. The mirror should move in the
commanded direction.
Circuit/System Testing
1. Ignition OFF, disconnect the X3 harness connector at the appropriate door module.
2. Ignition ON, verify a test lamp does not illuminate between the following control circuit terminals and ground:
* Control circuit terminal 1
* Control circuit terminal 2
* Control circuit terminal 6
瀚慖f the test lamp illuminates, test the appropriate control circuit for a short to voltage.
3. Ignition OFF, test for infinite resistance between the following control circuits and ground:
* Control circuit terminal 1
* Control circuit terminal 2
* Control circuit terminal 6
瀚慖f less the specified value, test the appropriate control circuit for a short to ground.
4. Test for 40-100 ohms between the control circuit terminal 1 and the control circuit terminal 6.
瀚慖f not within the specified range, test both control circuits for an open/high resistance. If the circuits test normal, test or replace the
rearview mirror.
5. Test for 40-100 ohms between the control circuit terminal 2 and the control circuit terminal 6.
瀚慖f not within the specified range, test both control circuit for an open/high resistance. If the circuits test normal, test or replace the
rearview mirror.
6. If all circuits test normal, replace the door module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Outside Rearview Mirror Motor Replacement (See: Body and Frame/Mirrors/Power Mirror Motor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for DDM or PDM replacement, setup, and
programming
B1640
DTC B1640
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B1640 01
- Mirror Heater Circuit Short to Battery
DTC B1640 02
- Mirror Heater Circuit Short to Ground
Diagnostic Fault Information
