Circuit/System Testing
WARNING: This page is about a different car, the 2007 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
Without Third Row Display
- Ignition OFF, disconnect the harness connector of the rear video display. Ignition ON, with a DMM verify there is 100 to 300 Hz on the video display brightness control signal circuit.
- If 100 to 300 Hz is not present on the video display brightness control signal circuit test for an open, a short to voltage, or a short to ground. If the video display brightness control signal circuit tests normal, replace the radio.
- If 100 to 300 Hz is present and the video display brightness control signal circuit tests normal, replace the rear video display.
With Third Row Display
- With a scan tool clear the DTC. Ignition OFF, Disconnect the third row video display. Ignition ON, verify the DTC resets.
- If the DTC does not reset, replace the third row video display.
- Ignition OFF, disconnect the harness connector of the rear video display. Ignition ON, with a DMM verify there is 100 to 300 Hz on the video display brightness control signal circuit.
- If 100 to 300 Hz is present and the video display brightness control signal circuit tests normal, replace the front rear video display.
- If 200 Hz is not present on the video display brightness control signal circuit test for an open, a short to voltage, or a short to ground. If the video display brightness control signal circuit tests normal, replace the radio.