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 MANUALSCHEVROLET2018TAHOE FL, 4WD, GASREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTDRIVERS ASSISTANCE SYSTEMS - ADASDRIVER ASSISTANCE SYSTEMSDIAGNOSTIC INFORMATION AND PROCEDURESSEAT HAPTIC SIGNAL MOTOR MALFUNCTIONCIRCUIT/SYSTEM TESTING
2018 Chevrolet Tahoe FL, 4WD, Gas
Circuit/System Testing
2018 Chevrolet Tahoe FL, 4WD, GasSECTION Circuit/System Testing
- Ignition OFF, disconnect the X5 harness connector at the K40D Seat Memory Control Module, ignition ON.
- Test for less than 1 V between the appropriate control circuit terminal listed below and ground:
- Terminal 4 - P45RR Seat Haptic Signal Motor - Driver Right Rear
- Terminal 5 - P45LR Seat Haptic Signal Motor - Driver Left Rear
- If 1 V or greater
Repair the short to voltage on the circuit.
- Go to next step: If less than 1 V
- Ignition OFF and all vehicle systems OFF.
- Install a 3 A fused jumper wire between the appropriate control circuit terminal listed below and B+.
- Terminal 4 - P45RR Seat Haptic Movement Motor - Driver Right Rear
- Terminal 5 - P45LR Seat Haptic Movement Motor - Driver Left Rear
- Verify the appropriate P45 Seat Haptic Movement Motor - Driver turns on and off.
- If the P45 Seat Haptic Movement Motor - Driver does not turn on and off
- Verify the circuit ground connection is clean and secure.
- If the ground connector is not clean or secure, repair as necessary.
- Go to next step: If the circuit ground connection is clean and secure
- Replace the appropriate P45 Seat Haptic Movement Motor - Driver.
- Go to next step: If the P45 Seat Haptic Movement Motor - Driver turn on and off
- Ignition OFF, connect the harness connector at the K40D Seat Memory Control Module - Driver, ignition ON.
- Verify the P45LR Haptic Signal Motor - Driver Left Rear turns on and off when commanding the Driver Seat Cushion Left Rear Haptic Movement On and Off with a scan tool.
- If the motor does not function
Replace the K40D Seat Memory Control Module - Driver.
- Go to next step: If the motor functions
- If the motor does not function
- Verify the P45RR Haptic Signal Motor - Driver Right Rear turns on and off when commanding the Driver Seat Cushion Right Rear Haptic Movement On and Off with a scan tool.
- If the motor does not function
Replace the K40D Seat Memory Control Module - Driver.
- Go to next step: If the motor functions
- If the motor does not function
- All OK.
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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.