Test K: The Stoplamps Are On Continuously

PINPOINT TEST K: THE STOPLAMPS ARE ON CONTINUOUSLY

Normal Operation
When the brake pedal is applied, the stoplamp switch routes voltage to the smart junction box (SJB) and the PCM through circuit CCB08 (VT/WH).

Fusion
The voltage is then routed through the SJB to the high mounted stoplamp through circuit CLS17 (YE/GY). The SJB also supplies voltage to the LH and RH rear stoplamps through circuits CLS18 (GY/BN) and CLS19 (VT/OG), respectively.

Milan, MKZ
The voltage is then routed through the SJB to the stoplamps through circuit CLS17 (YE/GY).

The rear lamps contain electronics that modulate the voltage frequency to the LED bulbs.

- DTC B1485 (Brake Pedal Input Short to Battery) - is an on-demand DTC that sets when the SJB detects a short to voltage from the stoplamp switch input circuit.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Stoplamp switch
- PCM
- SJB

K1-K8:

K9: