Circuit/System Testing
WARNING: This page is about a different car, the 2018 GMC Terrain and 2018 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition/Vehicle & All vehicle systems - Off
- Disconnect the electrical connector: S126 Drive Mode Select Switch
- Connect a test lamp between the test points: Control circuit terminal 1 & B+
- Perform the scan tool control function: Lane Departure Warning Indicator Command - On and Off
Verify the test lamp turns On and Off.
- If the test lamp is always Off
- Ignition/Vehicle - Off
- Disconnect the electrical connector: @ B174W Frontview Camera - Windshield
- Ignition - On/Vehicle - In Service Mode
- Test for less than 1 V between the test points: Control circuit terminal 4 @ B174W Frontview Camera - Windshield & Ground
- If greater than 1 V
Repair the short to voltage on the circuit.
- If less than 1 V
- If greater than 1 V
- Ignition/Vehicle - Off
- Test for less than 2 ohms between the test points: Control circuit terminal 4 @ B174W Frontview Camera - Windshield & Control circuit terminal 1 @ S126 Drive Mode Select Switch
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- If less than 2 ohms - Replace the component: B174W Frontview Camera - Windshield
- If the test lamp is always On
- Ignition/Vehicle - Off
- Disconnect the electrical connector: @ B174W Frontview Camera - Windshield
- Test for infinite resistance between the test points: Control circuit terminal 4 @ B174W Frontview Camera - Windshield & Ground
- If less than infinite resistance - Repair the short to ground on the circuit.
- If infinite resistance - Replace the component: B174W Frontview Camera - Windshield
- Test or replace the component: S126 Drive Mode Select Switch
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.
NOTE:
Verify interior lighting dimming is turned all the way up.