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Home >> Isuzu >> 2007 >> Ascender RWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Door Lock Systems & Door Handles >> Diagnostic Information and Procedures >> DTC B3808 >> Test Description

Test Description

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

  1. 2:  Listen for an audible click when the rear door lock relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3:  This step tests for voltage at the coil side of the rear door lock relay. The LOCKS fuse supplies power to the coil side of the rear door lock relay.
  3. 4:  This step verifies that the BCM is providing ground to the rear door lock relay.
  4. 5:  This step tests if ground is constantly being applied to the rear door lock relay.
DTC B3808

Step Action Yes No
Schematic Reference: Door Lock/Indicator Schematics 
Connector End View Reference: Vehicle Access Connector End Views  or Data Communication 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 door lock relay ON and OFF.
Does the rear door lock relay turn ON and OFF with each command?		 Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3 
  1. Remove the rear door lock relay.
  2. Probe the battery positive voltage circuit of the rear door 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 door lock relay control circuit and the battery positive voltage circuit of the rear door lock relay.
  2. With a scan tool, command the rear door lock ON and OFF.
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 door lock relay control circuit of the rear door 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 door lock relay control circuit of the rear door 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 rear door 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 rear door 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 door lock actuator lock or unlock circuits. Refer to Wiring Repairs .
Did you complete the repair?		 Go to Step 14  -
12 Replace the rear door 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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