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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. 2:  Command both the Lock and Unlock states. Repeat the commands as necessary.
  2. 3:  Tests for voltage at the coil side of the liftgate lock relay. The ECC fuse supplies power to the coil side of the liftgate lock relay.
  3. 4:  Verifies that the body control module is providing ground to the liftgate lock relay.
  4. 5:  Tests if ground is constantly being applied to the liftgate lock relay.
DTC B3825

Step Action Yes No
Schematic Reference: Door Lock/Indicator Schematics 
Connector End View Reference: Vehicle Access Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Install a scan tool.
  2. With a scan tool, command the rear doors to Lock and Unlock.
Does the liftgate Lock and Unlock with each command?		 Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3 
  1. Remove the liftgate lock relay.
  2. Probe the battery positive voltage circuit of the liftgate lock relay with a test lamp that is connected to a good ground.
Does the test lamp illuminate?		 Go to Step 4  Go to Step 8 
4 
  1. Connect a test lamp between the liftgate lock relay control circuit and the battery positive voltage circuit of the liftgate lock relay.
  2. With a scan tool, command the rear doors to Lock and Unlock.
Does the test lamp turn ON and OFF with each command?		 Go to Step 9  Go to Step 5 
5  Does the test lamp remain illuminated without being commanded? Go to Step 7  Go to Step 6 
6 Test the liftgate lock relay control circuit of the liftgate lock relay for an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 10 
7 Test the liftgate lock relay control circuit of the liftgate lock relay for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 10 
8 Test for an open or short to ground in the battery positive voltage circuit of the liftgate lock relay. Refer to Circuit Testing and Wiring Repairs .
Did you complete the repair?		 Go to Step 14  Go to Step 11 
9 Inspect for poor connections at the liftgate lock relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 13  Go to Step 12 
10 Inspect for poor connections at the harness connector of the body control module (BCM). 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 
11 Repair the short to ground in the liftgate lock actuator lock control circuit. Refer to Wiring Repairs .
Did you complete the repair?		 Go to Step 14  -
12 Replace the liftgate lock relay.
Did you complete the replacement?		 Go to Step 14  -
13 Replace the BCM. Refer to Control Module References for replacement, setup, and programming.
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 2  System OK
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