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.
Circuit/System Testing
2018 Chevrolet Traverse LS, 4WDSECTION Circuit/System Testing
- Ignition OFF/Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S38 Ignition Mode Switch. It may take up to 2 min for all vehicle systems to power down.
- Test for less than 10 Ω between the ground circuit terminal 4 and ground.
- If 10 Ω or greater
- Test for less than 2 Ω in the ground circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, repair the open/high resistance in the ground connection.
- Go to next step: If less than 10 Ω
- Test for less than 10 Ω between the low reference circuit terminal 7 and ground.
- If 10 Ω or greater
- Test for less than 2 Ω in the ground circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K84 Keyless Entry Control Module.
- Go to next step: If less than 10 Ω
- Connect the S38 Ignition Mode Switch, ignition ON/Vehicle in Service Mode.
- Disconnect the S38 Ignition Mode Switch.
- Verify the scan tool K9 Body Control Module Push Button Ignition Switch Voltage parameter is greater than 11 V.
- If 11 V or less
- Connect the S38 Ignition Mode Switch.
- Ignition OFF/Vehicle OFF, disconnect the X2 harness connector at the K9 Body Control Module and S38 Ignition Mode Switch.
- Test for infinite resistance between the signal circuit terminal 6 and ground.
- If less than infinite resistance, repair the short to ground on the circuit.
- If infinite resistance, replace the K9 Body Control Module.
- Go to next step: If greater than 11 V
- Install a 3 A fused jumper wire between the signal circuit terminal 6 and ground.
- Verify the scan tool K9 Body Control Module Push Button Ignition Switch Voltage parameter is less than 1 V.
- If 1 V or greater
- Disconnect the harness connector at the K9 Body Control Module.
- Test for less than 1 V between the signal circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- Go to next step: If less than 1 V
- Test for less than 2 Ω in signal circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K9 Body Control Module.
- Go to next step: If less than 1 V
- Connect the harness connector at the S38 Ignition Mode Switch.
- Verify the scan tool K9 Body Control Module Push Button Ignition Switch Voltage parameter is 8 - 10 V, with the S38 Ignition Mode Switch released.
- If not between 8 - 10 V
Test or replace the S38 Ignition Mode Switch.
- Go to next step: If between 8 - 10 V
- If not between 8 - 10 V
- Verify the scan tool K9 Body Control Module Push Button Ignition Switch Voltage parameter is 4 - 7 V, with the S38 Ignition Mode Switch pressed.
- If not between 4 - 7 V
Test or replace the S38 Ignition Mode Switch.
- Go to next step: If between 4 - 7 V
- If not between 4 - 7 V
- Disconnect the X1 harness connector at the K84 Keyless Entry Control Module.
- Test for infinite resistance between the signal circuit terminal 11 and ground.
- If less than infinite resistance
Repair the short to ground on the circuit.
- Go to next step: If infinite resistance
- If less than infinite resistance
- Ignition ON/Vehicle in Service Mode.
- Test for less than 1 V between the signal circuit terminal 11 and ground.
- If 1 V or greater
Repair the short to voltage on the circuit.
- Go to next step: If less than 1 V
- If 1 V or greater
- Test for 4.5 - 5.5 k Ω between the signal circuit terminal 11 and the low reference circuit terminal 12, with the S38 Ignition Mode Switch released.
- If not between 4.5 - 5.5 kΩ
- Ignition OFF/Vehicle OFF, disconnect the harness connector at the S38 Ignition Mode Switch.
- Test for less than 2 Ω in the signal circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, test or replace the S38 Ignition Mode Switch.
- Go to next step: If between 4.5 - 5.5 kΩ
- Test for 1 - 1.5 kΩ between the signal circuit terminal 11 and the low reference circuit terminal 12, with the S38 Ignition Mode Switch pressed.
- If not between 1 - 1.5 kΩ
Test or replace the S38 Ignition Mode Switch.
- Go to next step: If between 1 - 1.5 kΩ
- If not between 1 - 1.5 kΩ
- Replace the K84 Keyless Entry Control Module.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.