Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 670 (POWER SEAT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B1335CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, use a scan tool clear the current and history DTC.
- Determine which motor set the DTC by operating the motors listed below one at a time in both directions. Check for the DTC to set between each motor test.
- Driver seat front vertical motor
- Driver seat rear vertical motor
- Driver seat horizontal motor
- Driver seat horizontal lumbar motor
- Driver seat vertical lumbar motor
- Driver seat recline motor
- Steering column telescope motor
- Steering column tilt motor
- Clear the diagnostic trouble code.
- Ignition OFF, disconnect the harness connector at the appropriate seat, lumbar, or steering column motor listed below for which the DTC set.
- Seat adjuster assembly X1
- Seat recline motor X1
- Lumbar horizontal motor X1
- Lumbar vertical motor X2
- Steering column telescope motor X1
- Steering column tilt motor X1
- Ignition ON, operate the motor adjuster switch in both directions. DTC B1335 0B should not set.
- If the DTC sets, test for a short to ground or a short between the appropriate control circuits listed below: If the circuits test normal, replace the MSM.
- Front vertical motor terminal 2 and terminal 5
- Rear vertical motor terminal 1 and terminal 4
- Seat horizontal motor terminal 3 and terminal 6
- Seat recline motor terminal A and terminal B
- Lumbar vertical motor terminal A and terminal B
- Lumbar horizontal motor terminal A and terminal B
- Steering column telescope motor terminal A and terminal B
- Steering column tilt motor terminal A and terminal B
- If the DTC sets, test for a short to ground or a short between the appropriate control circuits listed below: If the circuits test normal, replace the MSM.
- If all circuits test normal, test or replace the appropriate seat, lumbar or steering column motor assembly.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.