Normal Operation
WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
Fused battery voltage is sent to one set of contacts in the start/stop switch from Body Control Module (BCM) fuse 28 (15A). When the switch is pressed, voltage is sent to the Body Control Module (BCM), the Remote Function Actuator (RFA) module and the PCM. The other set of contacts in the start/stop switch connects the BCM to ground. When the switch is pressed, the BCM detects this ground signal and takes appropriate action.
NOTE:
The RFA
module is only capable of setting DTC B108A:12 as a continuous memory DTC. It is possible for this DTC to be cleared and not return even if the condition that caused it is still present. If DTC B108A:12 is retrieved, carry out this PINPOINT TEST even if the DTC does not return.
- DTC B108A:12 (Start Button: Circuit Short to Battery) - This DTC sets if the RFA module detects a short to voltage on the start/stop switch input circuit, or if start/stop switch is stuck in the closed position.
This pinpoint test is intended to diagnose the following:
- Start/stop switch
- Wiring, terminals or connectors
- RFA module
- BCM
- PCM