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Home >> Suzuki >> 2006 >> Grand Vitara Base, AWD, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC P0571: Brake Switch Circuit >> DTC Troubleshooting
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DTC Troubleshooting

WARNING: This page is about a different car, the 2008 Suzuki Grand Vitara and 2007 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before this trouble shooting, read and observe Precautions for DTC Troubleshooting.
DTC TROUBLESHOOTING TABLE

Step Action YES NO
1  Brake light switch check 
  1. Check brake light switch referring to BRAKE LIGHT SWITCH INSPECTION .

Is it in good condition? 		 Go to Step 2. Replace brake light switch.
2  Brake light switch power circuit check 
  1. Disconnect connector from brake light switch connector with ignition switch turned OFF.
  2. Check for proper connection to switch connector.
  3. If connection are OK, measure voltage between each "BLU/BLK" wire terminal and "GRN" wire terminal of brake light switch connector and vehicle body ground with ignition switch tuned ON.

Is each measured voltage 10 - 14 V? 		 Go to Step 3. Check related fuse and repair defective circuit.
3  Brake light switch signal circuit check 
  1. Disconnect connectors from ECM with ignition switch turned OFF.
  2. Check for proper connection of each switch circuit terminal to ECM connector.
  3. If connections are OK, check brake light switch circuit for the following.
    • Resistance of each "YEL/GRN" wire terminal and "GRN/WHT" wire terminal of brake light switch between brake light switch connector and ECM connector is less than 1 Ω (continuity check)
    • Resistance between "YEL/GRN" wire terminal and "GRN/WHT" wire terminal of brake light switch connector are infinity (no continuity check)
    • Resistance between each "YEL/GRN" wire terminal and "GRN/WHT" wire terminal of brake light switch connector and vehicle body ground is infinity (ground short check)
    • Voltage of between each "YEL/GRN" wire terminal and "GRN/WHT" wire terminal of brake light switch connector and vehicle body ground is 0 V with ignition switch tuned ON (power short check)

Is it in good condition? 		 Substitute a known-good ECM and recheck. Repair or replace defective wire.
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