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Home >> Chevrolet >> 2004 >> Optra Base, Automatic >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Diagnostic Information and Procedures >> DTC C0161 >> Test Description

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 1:  This simple test will isolate the problem to the fuse-brake light switch-splice 301 area or the splice 301-EBCM area.
  2. 3:  This is the 1st step in identifying an open, a short to ground, a short to voltage, or a faulty brake light switch.
  3. 11:  This step begins the process of finding an open, a defective connector, or a faulty EBCM.
Step Action Values Yes No
1  Step on the brake pedal.
Do the brake lights come on at all?		 - Go to Step 3  Go to Step 2 
2 Remove your foot from the brake pedal.
Do the lights stay on continuously?		 - Go to Step 8  Go to Step 11 
3  Inspect fuse EF13 in the engine compartment fuse block.
Is fuse EF13 open?		 - Go to Step 4  Go to Step 6 
4
  1. Replace fuse EF13.
  2. Inspect the new fuse.
Is the new fuse open?		 - Go to Step 5  Go to Step 7 
5
  1. Repair the short to ground in the brake light circuitry.
  2. Install a new fuse EF13.
Did you complete the action?		 - System OK -
6 Repair the open in the brake light switch circuit OG/BK from terminal 6 of connector C102 at the engine fuse block to the brake light switch and circuit L-BU from terminal 11 of splice S301.
Did you complete the repair?		 - System OK -
7 Inspect for functioning of the brake lights and the antilock brake system (ABS) system.
Did you complete the action?		 - System OK -
8 Inspect the brake lamp switch adjustment. Refer to Stop Lamp Switch Adjustment in Lighting Systems.
Did the switch adjustment correct the condition?		 - Go to Step 10  Go to Step 9 
9 Replace the brake lamp switch.
Did you complete the repair?		 - System OK -
10 Repair the short to positive in the circuit YE between the brake light switch, splice S301, the brake lights, the center high-mounted stop lamp, and the ABS wiring harness connector at the electronic brake control module (EBCM) terminal 14.
Did you complete the repair?		 - System OK -
11 
  1. Disconnect the EBCM connector.
  2. Use a digital voltmeter (DVM) to measure voltage between pins 14 and 19 of the ABS harness connector at the EBCM.
  3. Have an assistant step on the brake pedal.
Does the voltage measure within the specified range?		 11-14 V Go to Step 13  Go to Step 12 
12
  1. Examine the connection between the ABS harness connector and the EBCM connector terminals 14 and 19.
  2. Examine the connection at terminal 1 of connector C110.
  3. Examine the wiring of circuit L-BU between splice S301 and terminal 14 of the ABS EBCM connector for an open condition.
  4. Examine the wiring between ground G106 and terminal 19 of the ABS EBCM connector.
  5. Repair the broken wire or the defective connector terminal, or replace the connector, the wiring harness as required.
Did you complete the repair?		 - System OK -
13 Inspect the interface between the ABS EBCM connector and the EBCM.
Is there damage at the interface?		 - Go to Step 14  Go to Step 15 
14 Repair the connector or replace the wiring harness or the ABS unit as required.
Did you complete the repair?		 - System OK -
15 Replace the ABS unit.
Did you complete the replacement?		 - System OK -
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