Diagnostic Aids
WARNING: This page is about a different variant/trim than selected.
- This diagnostic is used when high voltage has not been disabled when the contactors have been commanded closed. This indicates that one or both contactors are stuck open. The High Voltage Disabling procedure should still be completed, using the procedure for Servicing Any Internal Components Within the A4 Hybrid/EV Battery Pack. This will disconnect the battery terminals at the C4A Hybrid/EV Battery Section 1 and C4B Hybrid/EV Battery Section 2 and limit high voltage exposure when performing diagnosis.
- Be sure to check for any DTCs that may be set. These DTCs may lead to the cause of the stuck contactors and DTC diagnosis should be performed before enabling high voltage. This will help ensure a repeat fault with the contactors does not occur. After diagnosis any DTCs, return to this procedure to test and repair any contactor that may be mechanically stuck open.