Stoplight Switch

WARNING: This page is about a different car, the 2006 Mitsubishi Montero. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the connector.

Check for continuity between the terminals of the switch.

STOP LIGHT SWITCH SPECIFIED CONDITIONS

MEASUREMENT CONDITION	TERMINAL CONNECTOR OF TESTER	SPECIFIED CONDITION
When brake pedal is depressed. (for stoplight circuit)	1 - 2	Less than 2 ohms
When brake pedal is depressed. (for stoplight circuit)	3 - 4	Open circuit
When brake pedal is not depressed. (for auto-cruise control circuit)	1 - 2	Open circuit
	3 - 4	Less than 2 ohms

Fig 1: Identifying Stoplight Switch Connector Terminals

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.