Chevrolet Silverado / GMC Sierra. Service manual — part 2692

The reference voltage drops below 4.75 volts.

B1395 05

The reference voltage exceeds 5.15 volts.

Action Taken When the DTC Sets

All memory recall functions will be disabled.

Conditions for Clearing the DTC

The current DTC will clear 3 seconds after the reference voltage returns to normal operating
range, and the ignition is cycled OFF then back to ACC or RUN.

A history DTC will clear after 50 ignition cycles or with a scan tool using the clear DTCs
function.

Reference Information

Schematic Reference

Driver Seat Schematics

Passenger Seat Schematics

Adjustable Pedal Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Memory Seats Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Scan Tool Reference

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Power Seats - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Control Module References for Scan Tool Information

Diagnostic Aids

An internal short to ground in one of the position sensors may set this DTC.

Circuit/System Testing

Ignition ON, test for 4.75-5.15 volts between the 5-volt reference circuit and ground.

If less than 4.75 volts, test the 5-volt reference circuit to all position sensors for a short to
ground or an open. If the circuit tests normal, replace the memory seat module.

If greater than 5.15 volts, test the 5-volt reference circuit to all position sensors or a short to
voltage. If the circuit tests normal, replace the memory seat module.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Front Seat Adjuster Replacement (Power)

Front Seat Lumbar Support Replacement

Front Seat Recliner Actuator Motor Replacement

Brake Pedal Assembly Replacement

Control Module References for MSM replacement, setup, and programming

DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, OR B1820

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 B1735 01

Driver Seat Front Up Switch Circuit Short to Battery

DTC B1740 01

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Power Seats - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Driver Seat Front Down Switch Circuit Short to Battery

DTC B1745 01

Driver Seat Rear Up Switch Circuit Short to Battery

DTC B1750 01

Driver Seat Rear Down Switch Circuit Short to Battery

DTC B1755 01

Driver Seat Assembly Horizontal Forward Switch Circuit Short to Battery

DTC B1760 01

Driver Seat Assembly Horizontal Rearward Switch Circuit Short to Battery

DTC B1815 01

Driver Seat Recline Forward Switch Circuit Short to Battery

DTC B1820 01

Driver Seat Recline Rearward Switch Circuit Short to Battery

Circuit Description

When the power seat switches are pressed, they send a 12-volt signal through the switch signal
circuits to the memory seat module (MSM). The MSM then commands the driver seat motors to
move in response to the switch signals.

Conditions for Running the DTC

The memory seat module must be powered.

Conditions for Setting the DTC

If a seat switch circuit is active in one direction and the switch for the opposite direction is
pressed, this DTC will set.

Multiple DTCs will set if one of the switch signal circuits is shorted to voltage.

Action Taken When the DTC Sets

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Power Seats - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

A motor output driven in response to a switch considered failed, is deactivated for both
directions.

All memory recall commands are ignored.

The MSM will respond to any other switch signal that has not set a DTC.

Conditions for Clearing the DTC

The current DTC will clear and set the code to history, 3 seconds after the fault is no longer
present and the ignition is cycled OFF then back to ACC or RUN.

A history DTC will clear after 50 ignition cycles or with a scan tool using the clear DTCs
function.

Reference Information

Schematic Reference

Driver Seat Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Memory Seats Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Scan Tool Reference

Control Module References for Scan Tool Information

Circuit/System Verification

Ignition ON, observe the scan tool seat switch parameters while pressing the appropriate seat
directional switches. The reading should change between Inactive and Active.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Power Seats - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado