DTC 59
DTC 59: BRKDIAG High1. Turn the ignition switch OFF.
2. Check the brake lights without pressing the brake pedal.
Are the brake lights on?
YES-Replace the brake light relay.
NO-Go to step 3.
3. Turn the ignition switch ON (II).
4. Check the brake lights without pressing the brake pedal.
Are the brake lights on?
YES-Go to step 5.
NO-Go to step 9.
5. Turn the ignition switch OFF.
6. Disconnect the VSA modulator-control unit 46P connector.
7. Turn the ignition switch ON (II).
8. Check the brake lights without pressing the brake pedal.
Are the brake lights on?
YES-Go to step 9.
NO-Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit and retest.
9. Clear the DTC with the HDS.
10. Press the brake pedal for 3 seconds or more.
11. Check for DTCs with the HDS.
Is DTC 59 indicated?
YES-Go to step 12.
NO-Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit and retest.
12. Measure the voltage between the brake pedal position switch 4P connector terminal No. 2 and body ground with the headlights OFF and ON.
Is there less than 0.5 V?
YES-Go to step 13.
NO-Disconnect the taillight assemblies one at a time and recheck. If the voltage is OK, check the taillight ground connection and then replace the faulty taillight.
13. Turn the ignition switch OFF.
14. Short the SCS line with the HDS.
15. Disconnect the PCM connector A (49P), and the brake pedal position switch 4P connector.
16. Check for continuity between brake pedal position switch 4P connector terminal No. 2 and PCM connector A (49P) terminal No. 8.
Is there continuity?
YES-Replace the PCM.
NO-Repair open in the wire between the PCM and the brake pedal position switch.