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 MANUALSCHEVROLET1997CHEVY EXPRESS G3500, VAN CARGO, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 89 (MEMORY SYSTEM)SYSTEM TESTSLEFT SEAT DOES NOT MANUALLY MOVE IN ONE DIRECTION
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 F
Left Seat Does Not Manually Move In One Direction
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 FSECTION Left Seat Does Not Manually Move In One Direction
WARNING: This page is about a different car, the 1998 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
After repair or component replacement is completed, perform appropriate MEMORY SYSTEM CHECK under TROUBLE SHOOTING
to verify system is functioning properly.
- Perform POWER SEAT MEMORY SYSTEM CHECK under TROUBLE SHOOTING. Go to next step.
- Turn ignition switch to OFF position. Ground memory seat diagnostic connector. Memory seat/mirror module will chime once to indicate Mode 1 has been entered. Operate driver's seat switch in all directions. Memory seat/mirror module should chime once at each switch input. If any switch input does not cause a chime to sound, go to next step. If all switch inputs cause a chime to sound, go to step 5).
- Remove ground from memory seat diagnostic connector. After 5 seconds, 3 chimes will sound to indicate that diagnostic mode has been exited. Disconnect left seat switch Gray, 12-pin connector. See Figure . With suspect switch pressed, use DVOM to check voltage between ground and appropriate left seat switch harness connector terminal. See WIRING DIAGRAMS . If 10-15 volts exists, go to next step. If 10-15 volts does not exist, go to step 7).
- Check for open in appropriate wire between left seat switch and memory seat/mirror module. See WIRING DIAGRAMS . If circuit is okay, go to next step. If circuit is not okay, go to step 11).
- Check for short to ground in appropriate wire between memory seat/mirror module and seat motor. See WIRING DIAGRAMS . If circuit is okay, go to next step. If circuit is not okay, go to step 11).
- Replace suspect motor. See POWER SEATS article. Recheck system operation..
- For Riviera, go to step 10). For Aurora, go to next step.
- If inoperative function is recline function, go to next step. If inoperative function is not recline function, go to step 10).
- Check for open in Orange wire between left seat switch and splice S211. If circuit is okay, go to next step. If circuit is not okay, go tostep 11).
- Replace left seat switch. See POWER SWITCHES under REMOVAL & INSTALLATION. Recheck system operation.
- Repair open or short to ground in appropriate wire. Recheck system operation.
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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.