1.CHECK STOP LIGHT & BRAKE SWITCH CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the stop light & brake switch harness connector.
3) Turn the ignition switch to ON.
4) Measure the voltage between harness connector terminal and chassis ground.
Connector & terminal
4 door model
(B65) No. 3 (+) — Chassis ground (−):
5 door model
(B65) No. 1 (+) — Chassis ground (−):
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Is the voltage 10 V or more?
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• Check fuse No. 8 (in fuse & relay box).
• Check for open or short circuit in the harness between stop light & brake switch and fuse & relay box.
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2.CHECK STOP LIGHT & BRAKE SWITCH CIRCUIT.
Measure the voltage between harness connector terminal and chassis ground.
Connector & terminal
4 door model
(B65) No. 1 (+) — Chassis ground (−):
5 door model
(B65) No. 3 (+) — Chassis ground (−):
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Is the voltage 10 V or more?
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• Check fuse No. 4 (in fuse & relay box).
• Check for open or short circuit in the harness between stop light & brake switch and fuse & relay box.
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3.CHECK STOP LIGHT & BRAKE SWITCH CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector of ECM.
3) Measure the resistance between ECM harness connector terminal and stop light & brake switch harness connector terminal.
Connector & terminal
Turbo model
(B135) No. 20 — (B65) No. 2: (4 door model)
(B135) No. 28 — (B65) No. 4: (4 door model)
(B135) No. 20 — (B65) No. 4: (5 door model)
(B135) No. 28 — (B65) No. 2: (5 door model)
Non-turbo model
(B136) No. 12 — (B65) No. 2: (4 door model)
(B136) No. 13 — (B65) No. 4: (4 door model)
(B136) No. 12 — (B65) No. 4: (5 door model)
(B136) No. 13 — (B65) No. 2: (5 door model)
Diesel engine model
(B135) No. 18 — (B65) No. 2:
(B135) No. 19 — (B65) No. 4:
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Is the resistance less than 10 Ω?
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4.CHECK STOP LIGHT & BRAKE SWITCH.
Check the stop light & brake switch. 
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Is the stop light & brake switch and installation position OK?
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Replace the ECM.
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Replace the stop light & brake switch. Or adjust the installation position.
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