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Hummer H3. Manual - part 1549
If the test lamp does not illuminate, test the control circuit for a short to ground or an
open/high resistance. If the circuit tests normal, test or replace the outside rearview
mirror switch.
10. Ignition ON, with the outside rearview mirror switch in the DOWN position, verify a test
lamp illuminates between the control circuit terminal 2 and ground.
If the test lamp does not illuminate, test the control circuit for a short to ground or an
open/high resistance. If the circuit tests normal, test or replace the outside rearview
mirror switch.
11. Ignition ON, with the outside rearview mirror switch in the LEFT position, verify a test
lamp illuminates between the control circuit terminal 2 and ground.
If the test lamp does not illuminate, test the control circuit for a short to ground or an
open/high resistance. If the circuit tests normal, test or replace the outside rearview
mirror switch.
12. Ignition ON, with the outside rearview mirror switch in the RIGHT position, verify a test
lamp illuminates between the control circuit terminal 1 and ground.
If the test lamp does not illuminate, test the control circuit for a short to ground or an
open/high resistance. If the circuit tests normal, test or replace the outside rearview
mirror switch.
13. If all circuits test normal, test or replace the applicable outside rearview mirror motor.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Power Mirror Switch Replacement
Mirror Replacement
Control Module References for BCM replacement, setup and programming
REPAIR INSTRUCTIONS
POWER MIRROR SWITCH REPLACEMENT
2007 Hummer H3
2007 ACCESSORIES & EQUIPMENT Mirrors - H3