Chevrolet Silverado / GMC Sierra. Service manual — part 2658

DTC B1600 01

Mirror Motor Vertical Circuit Short to Battery

DTC B1600 02

Mirror Motor Vertical Circuit Short to Ground

DTC B1600 04

Mirror Motor Vertical Circuit Open

DTC B1605 01

Mirror Motor Horizontal Circuit Short to Battery

DTC B1605 02

Mirror Motor Horizontal Circuit Short to Ground

DTC B1605 04

Mirror Motor Horizontal Circuit Open

Diagnostic Fault Information

Circuit/System Description

The Driver Door Switch (DDS) or Passenger Door Switch (PDS) controls the mirror horizontal
and vertical motors through the use of bi-directional motor controls. When the mirror is
commanded up, voltage is supplied to the mirror vertical motor through the Driver/Passenger
Mirror Motor Right/Down Motors Common circuit and ground is supplied through the

Circuit

Short to

Ground

Open/High

Resistance

Short to

Voltage

Signal

Performance

Driver/Passenger Mirror Motor
Right Control

B1605 02

B1605 04

B1605 01

-

Driver/Passenger Mirror
Right/Down Motors Common

B1544 02

B1544 04

B1544 01

-

Driver/Passenger Mirror Motor
Down Control

B1600 02

B1600 04

B1600 01

-

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Mirrors - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Driver/Passenger Mirror Motor Down Control circuit. When the mirror is commanded down,
voltage is supplied to the mirror vertical motor through the Driver/Passenger Mirror Motor Down
Control circuit and ground is supplied through the Driver/Passenger Mirror Motor Right/Down
Motors Common circuit.

Horizontal controls operate in the same manner with the Driver/Passenger Mirror Motor
Right/Down Motors Common circuit supplying voltage and the Driver/Passenger Mirror Motor
Right Control circuit supply a ground to the mirror horizontal motor when the mirror is
commanded right. When the mirror is commanded left, voltage is supplied to the mirror
horizontal motor through the Driver/Passenger Mirror Motor Right Control circuit and ground is
supplied through the Driver/Passenger Mirror Motor Right/Down Motors Common circuit.

Conditions for Running the DTC

The power mirror is being commanded left, right, up, or down.

Conditions for Setting the DTC

B1544

An improper voltage level is detected on the Driver/Passenger Mirror Motor Right/Down Motors
Common circuit while the mirror is being commanded.

B1600

An improper voltage level is detected on the Driver/Passenger Mirror Motor Down Control
circuit while the mirror is being commanded.

B1605

An improper voltage level is detected on the Driver/Passenger Mirror Motor Right Control
circuit while the mirror is being commanded.

Action Taken When the DTC Sets

Mirror movement is suspended so long as the fault is present.

Conditions for Clearing the DTC

A current DTC will clear when the fault is no longer present.

A history DTC will clear after 40 malfunction-free ignition cycles.

Reference Information

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Mirrors - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

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

Scan Tool References

Control Module References 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 harness connector X3 at the appropriate door switch.

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

If 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:

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Mirrors - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Control circuit terminal 1

Control circuit terminal 2

Control circuit terminal 6

If less the specified value, test the appropriate control circuit for a short to ground.

4. Test for 40-100 ohms of resistance between the control circuit terminal 1 and the control

circuit terminal 6.

If 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 motor.

5. Test for 40-100 ohms of resistance between the control circuit terminal 2 and the control

circuit terminal 6.

If 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 motor.

6. 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

DTC B1580 OR B1590

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.

DTC Descriptors

DTC B1580

Mirror Horizontal Position Sensor Circuit

DTC B1590

Mirror Vertical Position Sensor Circuit

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Mirrors - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado