Operation CHARM: Car repair manuals for everyone.
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Brake Signal

BRAKE SIGNAL INSPECTION
1. Depress the accelerator pedal until the TT terminal indicates 6 volts.
2. Depress the brake pedal and check the voltage reading from the TT terminal.

Brake pedal depressed 0 volts
Brake pedal released 6 volts

If not as indicated, there is a malfunction in either the stop light switch or circuit.