Chevrolet Silverado / GMC Sierra. Manual — part 2661
Control circuit terminal 2
If less than the specified value, test the appropriate circuit for a short to ground. If the
circuits test normal, test or replace the rearview mirror motor.
4. Test for 5-15 ohms of resistance between the control circuit terminal 1 and the control
circuit terminal 2.
If 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 motor.
5. If all circuits test normal, replace the appropriate door switch.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Outside Rearview Mirror Motor Replacement
Control Module References for DDS or PDS replacement, setup, and programming
SYMPTOMS - MIRRORS
1. Perform the Diagnostic System Check - Vehicle before using the Symptom Tables in
order to verify that all of the following are true:
There are no DTCs set.
The control modules can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions.
Refer to the following system descriptions:
Outside Mirror Description and Operation (Heated Mirrors)Outside Mirror
Description and Operation (Power Mirrors)
Automatic Day-Night Mirror Description and Operation
Visual/Physical Inspection
Inspect for aftermarket devices which could affect the operation of the system. Refer to
Checking Aftermarket Accessories .
Inspect the easily accessible or visible system components for obvious damage or conditions
which could cause the symptom.
IMPORTANT: The following steps must be completed before using the symptom
tables.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Mirrors - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to
Testing for Intermittent Conditions and Poor Connections .
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the
symptom:
Heated Mirrors Inoperative
Automatic Day-Night Mirrors Inoperative (With RPO DL3/DR4) or Automatic Day-
Night Mirrors Inoperative (Without RPO DL3/DR4)
Power Mirror Folding Inoperative
Power Mirrors Inoperative
HEATED MIRRORS INOPERATIVE
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.
Diagnostic Fault Information
Circuit/System Description
The Driver Door Switch (DDS) and Passenger Door Switch (PDS) supply voltage to the outside
rearview mirror heater elements upon receipt of a serial data message from the HVAC module
indicating that the rear defrost system is active. The door switch supplies B+ through the
driver/passenger mirror heating element supply voltage circuit when a request is seen. Ground is
applied through the driver/passenger mirror heating low reference circuit.
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
Mirror Heating Element
Supply Voltage
B1640 02
1
B1640 01
-
Low Reference
-
1
1
-
1. Heated Mirror Malfunction
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Mirrors - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Reference Information
Schematic Reference
Outside Rearview Mirror Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Outside Mirror Description and Operation (Heated Mirrors) or Outside Mirror
Description and Operation (Power Mirrors)
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Sacn Tool Reference
Control Module References For Scan Tool Information.
Circuit/System Verification
1. Ignition ON, press the rear window defogger switch. Verify the rear window defogger
indicator illuminates.
If the rear window defogger indicator does not illuminate, refer to Rear Window
Defogger Malfunction .
2. Rear window defogger ON, verify both the left and right outside mirror glass become warm.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector X3 at the appropriate door switch.
2. Ignition ON, verify a test lamp does not illuminate between the supply voltage circuit
terminal 7 and ground.
If the test lamp illuminates, test the supply voltage circuit for a short to voltage.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Mirrors - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
3. Ignition OFF, test for infinite resistance between the supply voltage circuit terminal 7 and
ground.
If less than the specified value, test the supply voltage circuit for a short to ground. If
the circuit tests normal, test or replace the applicable rearview mirror face.
4. Test for 5-10 ohms of resistance between the supply voltage circuit terminal 7 and the low
reference circuit terminal 3.
If not within the specified range, test the supply voltage circuit and the low reference
circuit for an open/high resistance. If the circuits test normal, test or replace the
appropriate rearview mirror face.
5. If all circuits test normal, test or replace the appropriate door switch.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Outside Rearview Mirror Glass Replacement
Control Module References for DDS or PDS replacement, setup and programming
AUTOMATIC DAY-NIGHT MIRRORS INOPERATIVE (WITH RPO DL3/DR4)
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.
Diagnostic Fault Information
Circuit/System Description
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
Backup Lamp Supply Voltage
1
1
2
-
Automatic Day/Night Mirror
Signal
2
2
1
-
Low Reference
-
2
2
-
1. Rearview mirror remains dimmed in reverse
2. Rearview mirror does not dim
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Mirrors - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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