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Home >> Hummer >> 2003 >> H2 >> Repair and Diagnosis >> Brakes >> Traction Control >> Antilock Brake System >> Diagnostic Information and Procedures >> DTC B3626 >> Test Description

Test Description

The number below refers to the step number on the diagnostic table.

  1. 4:  This step tests for voltage on the TC2 mode switch signal circuit indicating an unpressed TC2 mode switch.
  2. 5:  This step tests for voltage on the TC2 mode switch signal circuit indicating a pressed TC2 mode switch.
DTC B3626

Step Action Values Yes No
Schematic Reference:  ABS Schematics  
Connector End View Reference: ABS Connector End Views 
1 Did you perform the ABS Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - ABS 
2
  1. Use a scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 5 seconds.
  3. Start the engine.
  4. Observe the scan tool for up to 60 seconds in order to verify the DTC resets.
Does the DTC set?		 - Go to Step 3  Go to Diagnostic Aids
3
  1. Turn OFF the ignition.
  2. Disconnect the TC2 mode switch harness connector.
  3. Turn ON the ignition.
  4. Connect a test lamp between the IGN 1 voltage circuit, IGN E fuse, and a good ground.
Does the test lamp illuminate?		 - Go to Step 4  Go to Step 11 
4 
  1. Turn OFF the ignition.
  2. Reconnect the TC2 mode switch harness connector.
  3. Turn ON the ignition.
  4. Backprobe the TC2 mode switch harness connector in order to connect a DMM between the TC2 mode switch signal circuit and a good ground. Refer to Probing Electrical Connectors .
  5. Measure the DC voltage on the TC2 mode switch signal circuit.
Does the TC2 mode switch signal measure with in the specified range?		 12 V Go to Step 5  Go to Step 6 
5 
  1. Press and hold the TC2 mode switch.
  2. Use a DMM in order to measure the DC voltage on the TC2 mode switch signal circuit.
Does the TC2 mode switch signal measure within the specified range?		 0.5 V Go to Step 7  Go to Step 13 
6 Test the TC2 mode switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 12 
7
  1. Turn OFF the ignition.
  2. Disconnect the wiring harness connector from the EBCM.
  3. Connect the J 39700  universal pinout box using the. See Special Tools . J 39700-530 cable adapter to the EBCM harness connector only.
  4. Turn ON the ignition.
  5. Use a DMM in order to measure the DC voltage on the TC2 mode switch signal circuit.
Does the TC2 mode switch signal measure within the specified range?		 12 V Go to Step 9  Go to Step 8 
8 Repair the open in the TC2 mode switch signal circuit. Refer to Wiring Repairs .
Did you complete the repair?		 - Go to Step 14  -
9 Inspect for poor connections at the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 10 
10 Replace the EBCM. Refer to Electronic Brake Control Module Replacement .
Did you complete the replacement?		 - Go to Step 14  -
11 Repair the open or short to ground in the IGN 1 voltage circuit, IGN E fuse. Refer to Circuit Testing and Wiring Repairs .
Did you complete the repair?		 - Go to Step 14  -
12 Inspect for open in the TC2 switch ground circuit or poor connections at the harness connector of the TC2 mode switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 13 
13 Replace the TC2 mode switch. Refer to Traction Control Switch Replacement 
Did you complete the replacement?		 - Go to Step 14  -
14
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 - Go to Step 3  System OK
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