Chevrolet Silverado / GMC Sierra. Manual — part 2691
Circuit/System Description
The memory seat module (MSM) monitors the current supplied to the seat adjuster motors. The
MSM can detect both absolute and differential current levels from the seat motors. Absolute
current is the maximum allowable current the module will supply to the motors. A differential
current mismatch occurs when the current supplied to the seat motors does not match the current
returning from the motors.
Conditions for Running the DTC
The MSM establishes that it is not closing to a shorted motor control circuit before the motors are
active.
Conditions for Setting the DTC
The following conditions exist for more than 1 second:
B1335 00
Current out of the module does not match the current returning to the module within 5 amps.
B1335 0B
The absolute current or an over-current has exceeded the maximum value allowed.
B1335 42
This DTC will set if the module calibration is not programmed.
B1335 4B
This DTC will set if the module calibration is out of range.
Action Taken When the DTC Sets
The adjustable pedal motor and all driver seat adjuster motors are disabled.
Rearward Control
B3920 02
1
B3920 01
B1335 0B
Adjustable Pedal Motor
Forward Control
B3920 02
1
B3920 01
B1335 00
B1335 0B
Adjustable Pedal Motor
Rearward Control
B3920 02
1
B3920 01
B1335 00
B1335 0B
1. Power seat motor inoperative
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Power Seats - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Conditions for Clearing the DTC
The current DTC will clear and set the code to history, 3 seconds after no motor movement
is requested or the current is no longer mismatched, 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
Control Module References for Scan Tool Information
Module Internal Malfunction
If DTCs B1335 42 or B1335 4B are set history or current, the only option is module replacement.
Circuit/System Testing
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Power Seats - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
1. Use a scan tool to clear the current and history diagnostic trouble code.
2. Ignition ON, while observing the scan tool for DTCs, operate the seat adjuster switch in
both directions for each directional motor.
3. Disconnect the suspect seat motor for which the DTC set.
4. Clear the current and history diagnostic trouble code.
5. While observing the scan tool for DTCs, operate the suspect seat motor adjuster switch in
both directions.
If the DTC set current or history, test the motor control circuits for a short to ground,
or an open/high resistance. If the circuits test normal, replace the memory seat module.
6. If all circuits/connections test normal, replace the seat motor.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Front Seat Recliner Actuator Motor Replacement
Front Seat Lumbar Support Replacement
Front Seat Adjuster Replacement (Power)
Brake Pedal Assembly Replacement
Control Module References for MSM replacement, setup, and programming
DTC B1395
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 B1395 02
Device Voltage Reference Output Circuit Shorted to Ground
DTC B1395 05
Device Voltage Reference Output Circuit Shorted to Battery or Open
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Power Seats - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Diagnostic Fault Information
Circuit/System Description
The memory seat module (MSM) supplies a 5-volt reference voltage to the driver seat and
adjustable pedal position sensors. The MSM monitors this reference voltage to ensure the
accuracy of the voltages being returned from the sensors. If the voltage exceeds the normal
operating range, errors will occur in the memory recall operations of the seat and adjustable
pedals.
Conditions for Running the DTC
The memory seat module must be powered.
Conditions for Setting the DTC
The following conditions exist for more than 1 second:
B1395 02
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
5-Volt Reference
B1395 02
B1395 05
B1395 05
-
Memory Seat Sensor Low
Reference
-
B1825 01,
B1850 01,
B1860 01,
B2355 01,
B2365 01,
B2375 01
-
-
Driver Seat Front Vertical
Position Sensor Signal
B2355 06
B2355 06
B2355 01
-
Driver Seat Rear Vertical
Position Sensor Signal
B2365 06
B2365 06
B2365 01
-
Driver Seat Horizontal Position
Sensor Signal
B2375 06
B2375 06
B2375 01
-
Driver Seat Lumbar Vertical
Position Sensor Signal
B1860 06
B1860 06
B1860 01
-
Driver Seat Lumbar Horizontal
Position Sensor Signal
B1850 06
B1850 06
B1850 01
-
Driver Seat Recline Position
Sensor Signal
B1825 06
B1825 06
B1825 01
-
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Power Seats - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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