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P0571-BRAKE SWITCH 1 PERFORMANCE (CONTINUED) 2. (B29) BRAKE SWITCH NO.1 SIGNAL SHORTED TO GROUND Turn the ignition off. Disconnect the Stop Lamp Switch harness connector. Disconnect the C3 PCM harness connector. Measure the resistance between ground and the (B29) Brake Switch Is the resistance below 100 ohms? Yes >> Repair the short to ground in the (B29) Brake Switch No.1 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 3 3. (L50) BRAKE LAMP SWITCH OUTPUT CIRCUIT OPEN Disconnect the C1 FCM harness connector. Measure the resistance of the (L50) Brake Lamp Switch Output circuit Is the resistance below 5.0 ohms? Yes >> Go To 4 No >> Repair the open in the (L50) Brake Lamp Switch Output circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 595 |