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 MANUALSCHEVROLET2006SUBURBAN C2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2068 (POWER SEAT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B1335CIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban C2500, 6.0 U
Circuit/System Testing
2006 Chevrolet Suburban C2500, 6.0 USECTION Circuit/System Testing
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DTC B1335 00 or B1335 0B
- Ignition ON, use a scan tool to clear the current and history diagnostic trouble code.
- Determine which motor set this 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 recline motor
- Driver seat lumbar horizontal motor
- Driver seat lumbar vertical motor
- Adjustable pedal motor
- Clear the diagnostic trouble codes.
- Ignition OFF, disconnect the X1 harness connector at the appropriate seat adjuster assembly, lumbar adjuster assembly, or the adjustable pedal motor for which the DTC set.
- Ignition ON, operate the motor adjuster switch in both directions. DTC B1335 00 or B1335 0B should not set.
- If the DTC sets, test for a short between appropriate motor 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 C and terminal D
- Adjustable pedal motor terminal 4 and terminal 5
- Test the appropriate control circuits listed below for a high resistance. If all circuits test normal, test or replace the appropriate seat, lumbar, or adjustable pedal motor.
- 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 C and terminal D
- Adjustable pedal motor terminal 4 and terminal 5
DTC B1335 42 or B1335 4B
Verify that DTC B1335 42 or B1335 4B is not set.
- If either DTCs is set, replace the MSM.
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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.