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 MANUALSCHEVROLET2018TRAVERSE LS, 4WDREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSPOWER DOOR LOCK SYSTEM AND RELEASE SYSTEMSDIAGNOSTIC INFORMATION AND PROCEDURESDTC B3938CIRCUIT/SYSTEM TESTING
2018 Chevrolet Traverse LS, 4WD
Circuit/System Testing
2018 Chevrolet Traverse LS, 4WDSECTION Circuit/System Testing
- Ignition/Vehicle - Off
- Disconnect the electrical connector: M97 Fuel Fill Door Lock Actuator
- Connect a test lamp between the test points: Control circuit terminal 1 & Control circuit terminal 2
- Ignition - On/Vehicle - In Service Mode
- Operate the component: S13D Door Lock Switch - Driver - Lock & Unlock
- Verify the test lamp does not turn On and Off.
- If the test lamp turns On and Off
Test or replace the component: M97 Fuel Fill Door Lock Actuator
- Go to next step: If the test lamp does not turn On and Off
- If the test lamp turns On and Off
- Disconnect the electrical connector: X6 @ K9 Body Control Module
- Disconnect the electrical connector: X1 @ X53A Fuse Block - Rear Body
- Test for less than 2 ohms between the test points:
- Control circuit terminal 1 @ Component harness & Terminal 4 X6 @ Control module harness
- Control circuit terminal 2 @ Component harness & Terminal 43 X1 @ Fuse Block Harness
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- Go to next step: If less than 2 ohms
- Ignition/Vehicle & All vehicle systems - Off
- Connect the electrical connector: X6 @ K9 Body Control Module
- Connect the electrical connector: X1 @ X53A Fuse Block - Rear Body
- Disconnect the electrical connector: X2 @ X53A Fuse Block - Rear Body
- Test for less than 10 ohms between the test points: Ground circuit terminal 34 & Ground
- If 10 ohms or greater
- Ground Connection - Disconnect
- Test for less than 2 ohms between the test points: Ground circuit terminal 34 & Ground Connection
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- If less than 2 ohms - Repair the open/high resistance in the ground connection.
- Go to next step: If less than 10 ohms
- Connect the electrical connector: X2 @ X53A Fuse Block - Rear Body
- Disconnect the electrical connector: X7 @ K9 Body Control Module
- Ignition - On/Vehicle - In Service Mode
- Momentarily connect a 3 A fused jumper wire between the test points: Control circuit terminal 4 X7 & B+
Verify the component produces a clicking sound: KR132 Fuel Fill Door Lock Relay
- If the component does not produce a sound
- Ignition/Vehicle - Off & Remove - Jumper wire(s)
- Disconnect the electrical connector: X1 @ X53A Fuse Block - Rear Body
- Ignition - On/Vehicle - In Service Mode
- Test for less than 1 V between the test points: Control circuit terminal 4 X7 @ Control module harness & Ground
- If 1 V or greater - Repair the short to voltage on the circuit.
- Go to next step: If less than 1 V
- Ignition/Vehicle - Off
- Test for infinite resistance between the test points: Control circuit terminal 4 X7 @ Control module harness & Ground
- If less than infinite resistance - Repair the short to ground on the circuit.
- Go to next step: If infinite resistance
- Test for less than 2 ohms between the test points: Control circuit terminal 4 X7 @ Control module harness & Control circuit terminal 36 X1 @ Fuse Block Harness
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- If less than 2 ohms - Test or replace the component: X53A Fuse Block - Rear Body
- Go to next step: If the component turns On and Off
- Replace the component: K9 Body Control Module
NOTE:
It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.
RENDER: 1.0x
NO RELATED
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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.