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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Antilock Brake System With TCS) >> Diagnostic Information and Procedures >> DTC B3626 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers 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: Antilock Brake System Schematics 
Connector End View Reference: Antilock Brake System Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
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 electronic brake control module (EBCM).
  3. Connect the J 39700  universal pinout box using the J 39700-530  cable adapter to the EBCM harness connector only. See Special Tools .
  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 Control Module References for replacement, setup, and programming.
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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