Circuit/System Testing

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

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.

Ignition/Vehicle & All vehicle systems - Off
Disconnect the appropriate electrical connector:
- S65D Seat Lumbar Support Switch - Driver
- S65P Seat Lumbar Support Switch - Passenger
Test for less than 10 ohms between the test points:Ground circuit terminal E & Ground
- If 10 ohms or greater
1. Disconnect the ground connection:
2. Test for less than 2 ohms between the test points:Ground circuit terminal E@Component harness & The other end of the circuit@Ground terminal
  - 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
Verify a test lamp turns On between the test points:B+ circuit terminal G & Ground
- If the test lamp does not turn On and the circuit fuse is OK
1. Remove - Test Lamp
2. Test for less than 2 ohms between the test points:B+ circuit terminal G & Output terminal@Fuse
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.
- If the test lamp does not turn On and the circuit fuse is open
1. Remove - Test Lamp
2. Test for infinite resistance between the test points: B+ circuit terminal G & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
3. Replace the component:Fuse
4. Connect the electrical connector:S65 Seat Lumbar Support Switch
  Verify the fuse does not open.
  - If the fuse opens - Test or replace the component:S65 Seat Lumbar Support Switch
  - Go to next step: If the fuse does not open
5. Operate the component: - S65 Seat Lumbar Support Switch - Forward & Rearward
  Verify the fuse does not open.
  - If the fuse opensTest for infinite resistance between the test points:
  - Control circuit terminal 1@Component harness & Ground
  - Control circuit terminal 2@Component harness & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - If infinite resistance - Test or replace the component:M53 Seat Lumbar Support Motor
  - Go to next step: If the fuse does not open.
6. All OK.
- Go to next step: If the test lamp turns On
Disconnect the electrical connector:M53 Seat Lumbar Support Motor
Connect a test lamp between the test points:Control circuit terminal 1 & Control circuit terminal 2
Operate the component:S65 Seat Lumbar Support Switch - Forward & Rearward
Verify the test lamp turns On.
- If the test lamp remains Off during either of the commands
1. Ignition/Vehicle - Off & Remove - Test lamp
2. Disconnect the electrical connector:S65 Seat Lumbar Support Switch
3. Test for less than 2 ohms between the test points:
  - Control terminal 1@Component harness & Terminal B@S65 Seat Lumbar Support Switch
  - Control terminal 2@Component harness & Terminal C@S65 Seat Lumbar Support Switch
    - If 2 ohms or greater - Repair the open/high resistance in the circuit.
    - If less than 2 ohms - Test or replace the component: S65 Seat Lumbar Support Switch
- Go to next step: If the test lamp turns On for each command
Test or replace the component:M53 Seat Lumbar Support Motor