Circuit/System Testing
WARNING: This page is about a different car, the 2020 GMC Terrain and 2020 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: X4 @ K157 Video Processing Control Module
- Wait for greater than 5 s.
- Connect appropriate EL-52552pinout tool to K157 Video Processing Control Module
- Ignition - On / Vehicle - In Service Mode
- Test for 7 to 11 V between the test points: Signal circuit terminal 1-TN @ K157 Video Processing Control Module & Ground (component side)
- If not between 7 and 11 V
Replace the component: K157 Video Processing Control Module
- Go to next step: If between 7 and 11 V
- If not between 7 and 11 V
- Ignition/Vehicle & All vehicle systems - Off
- Disconnect the electrical connector: B225L Sideview Camera - Left
- Locate the appropriate pinout adapter and load test loop adapter from EL-52552 COAX FAKRA Cable Adaptor Kit.
- Connect the 2 adapters together, measure and record the resistance between the terminals at the pinout adapter.
- Disconnect the 2 adapters and connect each one to the appropriate end of the coax cable.
- At the pinout adapter test terminals, measure the total resistance of the coax cable loop including the connected load test adapter.
- If not within 5 Ω of the reading from step 10.
Replace the coax cable
- Go to next step: If within 5 Ω of the reading from step 10.
- If not within 5 Ω of the reading from step 10.
- Replace the component: B225L Sideview Camera - Left
- Apply the parking brake.
- Engine Running Transmission in Reverse
- Verify DTC B399C is not set.
- If the DTC is set
Replace the component: K157 Video Processing Control Module
- Go to next step: If the DTC is not set
- If the DTC is set
- All OK.
NOTE:
Before testing the coax cable, check the cable's exterior for being pinched, cut, damaged, or having loose connections at the components, all of which can cause reception issues.
NOTE:
If the condition is intermittent or cannot be duplicated, disconnect the connectors and add dielectric grease or lubricant (Nyogel 760G or equivalent, meeting GM specification 9986087). This procedure will correct the high resistance condition due to terminal fretting corrosion.