Component Signal

"Signal" From Stoplight Switch (Test Connections):

TEST 1
Do stoplights operate when brake pedal is depressed?

YES -- Go to Test 2.

NO -- Check stoplights.

TEST 2
Is Powertrain Control Module (PCM) terminal 2 voltage OK with PCM connector disconnected?

Voltage:
- Brake pedal depressed: Battery positive voltage
- Brake pedal Released: Approx. 0 Volts

YES -- Replace PCM.

NO -- Repair wiring harness (Stoplight switch terminal [LG] to PCM terminal 2)