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Home >> Isuzu >> 2007 >> Ascender RWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Window Motors & Regulators >> Fixed & MOVEABLE Window Systems >> Diagnostic Information and Procedures >> DTC B3820 >> 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 left rear power window 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 left rear power window down relay.
  3. 4:  This step verifies that the BCM is providing ground to the left rear power window down relay.
  4. 5:  This step tests if ground is constantly being applied to the left rear power window down relay.
DTC B3820

Step Action Yes No
Schematic Reference: Moveable Window Schematics 
Connector End View Reference: Window Systems 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. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the left rear power window down relay ON and OFF.
Does the left rear power window up relay turn ON and OFF with each command?		 Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the left rear power window switch.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the battery positive voltage circuit of the left rear power window switch with a test lamp that is connected to a good ground.
Does the test lamp illuminate?		 Go to Step 4  Go to Step 10 
4 
  1. Connect a test lamp between the control circuit of the left rear power window down relay and the battery positive voltage circuit of the left rear power window switch.
  2. With a scan tool, command the left rear power window down relay ON and OFF.
Does the test lamp turn ON and OFF with each command?		 Go to Step 8  Go to Step 5 
5  Does the test lamp remain illuminated with each command? Go to Step 7  Go to Step 6 
6 Test the control circuit of the left rear power window down relay for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 13  Go to Step 9 
7 Test the control circuit of the left rear power window down relay for a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 13  Go to Step 9 
8 Inspect for poor connections at the left rear power window switch. 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 11 
9 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 13  Go to Step 12 
10 Repair the open or short to ground in the battery positive voltage circuit of the left rear power window switch. Refer to Wiring Repairs .
Did you complete the repair?		 Go to Step 13  -
11 Replace the left rear power window switch.
Did you complete the replacement?		 Go to Step 13  -
12 Replace the BCM. Refer to Control Module References for replacement, setup and programming.
Did you complete the replacement?		 Go to Step 13  -
13
  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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