2010 Cadillac CTS Sedan AWD V6-3.6L Page 412

2010 Cadillac CTS Sedan AWD V6-3.6L Page 412

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool Mirror Horizontal Position and Mirror Vertical Position parameters. The reading should be between 0.2-4.8 V

and change as the mirror is moved, left, right, up, and down.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate outside rearview mirror.

2. Ignition OFF, wait 1 minute, test for less than 1.0 ohm between the low reference circuit terminal 12 and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the

appropriate door module.

3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 9 and ground.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the door module.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the door module.

4. Install a 3A fused jumper wire between the signal circuit terminal 10 and the 5 V reference circuit terminal 9. Verify the scan tool Mirror

Vertical Position parameter is greater than 4.8 volts.

瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the door module.

5. Install a 3A fused jumper wire between the signal circuit terminal 11 and the 5 V reference circuit terminal 9. Verify the scan tool Mirror

Horizontal Position parameter is greater than 4.8 V.

瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the door module.

6. Install a 3A fused jumper wire between the signal circuit terminal 10 and the low reference circuit terminal 12. Verify the scan tool Mirror

Vertical Position parameter is less than 0.2 V.

瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the door module.

7. Install a 3A fused jumper wire between the signal circuit terminal 11 and the low reference circuit terminal 12. Verify the scan tool Mirror

Horizontal Position parameter is less than 0.2 V.

瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the door module.

8. If all circuits test normal, test or replace the outside rearview mirror motor.

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 and PDM replacement, setup, and

programming

B1590

DTC B1580 or B1590

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.