C0870 - Lighting Systems
DTC C0870CIRCUIT DESCRIPTION
The body control module (BCM) applies a ground through the brake sensor reference low circuit to the brake pedal position sensor The BCM supplies a 10-volt reference through the brake sensor reference voltage circuit to the brake position sensor When the brake pedal is being applied, the brake pedal position sensor then sends a variable voltage signal through the brake sensor signal circuit to the BCM.
CONDITIONS FOR RUNNING THE DTC
The battery voltage must be between 9.0-16.0 volts.
ACTION TAKEN WHEN THE DTC SETS
The stop lamps will not function correctly.
CONDITIONS FOR CLEARING THE DTC
- The DTC will clear on current status after the condition for setting the fault is corrected.
- A history DTC will clear after 100 consecutive ignition cycles without a fault present.
- A History or current DTC can be cleared using a scan tool.
CONDITIONS FOR SETTING THE DTC
- A short to ground or an open in the brake pedal position sensor voltage reference circuit is present.
- A short battery positive voltage in the brake pedal position sensor voltage reference circuit is present.
DIAGNOSTIC AIDS
Perform a visual inspection for loose or poor connections at all related components.
TEST
Steps 1 - 6:
Steps 7 - 11:
