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Home >> Isuzu >> 2007 >> Ascender RWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Heated Glass/Defoggers >> Fixed & MOVEABLE Window Systems >> Diagnostic Information and Procedures >> Power Window Inoperative - Passenger Door (Rear Door) >> Diagnostic Aids

Diagnostic Aids

Power window motors have a built-in circuit breaker which protects the motor. The circuit breaker may open when there is a window obstruction, binding condition or the power window switch has been activated for an extended period of time. The circuit breaker will reset automatically as the circuit breaker cools, however 5-15 seconds may elapse before the circuit breaker resets.

Power Window Inoperative - Passenger Door (Rear Door)

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. Disable the window lockout function.
  2. Operate the passenger rear power windows in the UP and DOWN directions from the passenger power window switches.
Do the passenger rear power windows operate properly?		 Go to Step 3  Go to Step 4 
3 Operate the passenger rear power windows in the UP and DOWN directions from the master switches.
Do the passenger rear power windows operate properly from the master switches?		 Go to Testing for Intermittent Conditions and Poor Connections Go to Step 6 
4 Are both rear power windows inoperative? Go to Step 5  Go to Step 9 
5
  1. Install a scan tool.
  2. Monitor the Window Lockout Data parameter in the driver door module (DDM) input list.
  3. Place the window lockout switch in both the ON and OFF positions.
Does the window lockout data parameter change accordingly?		 Go to Step 22  Go to Step 23 
6
  1. Install a scan tool.
  2. Monitor the Rear Window Status Data parameters in the DDM inputs list.
Do either of the Rear Window Status Data parameters display an active state without a rear window switch activation?		 Go to Step 23  Go to Step 7 
7
  1. Install a scan tool.
  2. Monitor the Rear Window Status Data parameters in the DDM inputs list.
  3. Activate the passenger rear power window switches on the master switch in the up and down positions.
Do the rear window status data parameters change accordingly?		 Go to Step 8  Go to Step 23 
8
  1. With a scan tool, monitor the Passenger Rear Window Status Data parameters in the body control module (BCM) data list.
  2. Activate the passenger rear power window switches on the master switch in the up and down positions.
Do the rear window status data parameters change accordingly?		 Go to Step 15  Go to Step 22 
9
  1. Disable the window lockout function.
  2. Disconnect the inoperative rear window switch.
  3. Connect a test lamp to a good ground.
  4. Probe the window lockout signal circuit at the rear window switch harness connector.
Does the test lamp illuminate?		 Go to Step 10  Go to Step 17 
10 With a test lamp connected to a good ground, probe the battery positive voltage circuit at the rear power window switch harness connector.
Does the test lamp illuminate?		 Go to Step 11  Go to Step 26 
11
  1. Connect a test lamp to battery positive voltage.
  2. Probe the ground circuit at the rear power window switch harness connector.
Does the test lamp illuminate?		 Go to Step 12  Go to Step 27 
12
  1. Disconnect the appropriate rear power window motor.
  2. Connect the rear power window switch.
  3. Connect a test lamp to a good ground.
  4. Probe the power window motor up control circuit at the power window motor harness connector.
  5. Activate the power window switch to the UP position.
Does the test illuminate?		 Go to Step 13  Go to Step 20 
13
  1. With the test lamp still connected to a good ground, probe the power window motor down control circuit.
  2. Activate the power window switch to the DOWN position.
Does the test lamp illuminate?		 Go to Step 14  Go to Step 21 
14
  1. Connect a test lamp between the power window motor up and down control circuits.
  2. Activate the power window switch to the UP and DOWN positions.
Does the test lamp illuminate in both positions?		 Go to Step 25  Go to Step 24 
15
  1. Disconnect the appropriate rear power window switch.
  2. With a test lamp connected to battery positive voltage, probe the power window up signal circuit at the rear window switch harness connector.
  3. Activate the appropriate rear window switch on the master switch to the UP position.
Does the test lamp illuminate?		 Go to Step 16  Go to Step 18 
16
  1. With a test lamp connected to battery positive voltage, probe the power window down signal circuit at the rear window switch harness connector.
  2. Activate the appropriate rear window switch on the master switch to the DOWN position.
Does the test lamp illuminate?		 Go to Step 24  Go to Step 19 
17 Test for an open in the window lockout signal circuit. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 32  Go to Step 22 
18 Test for an open or short to ground in the power window up signal circuit. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 32  Go to Step 22 
19 Test for an open or short to ground in the power window up signal circuit. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 32  Go to Step 22 
20 Test for an open or short to ground in the power window motor up control circuit. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 32  Go to Step 24 
21 Test for an open or short to ground in the power window motor down control circuit. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 32  Go to Step 24 
22 Inspect for poor connections at the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 32  Go to Step 28 
23 Inspect for poor connections at the DDM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 32  Go to Step 29 
24 Inspect for poor connections at the passenger 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 32  Go to Step 30 
25 Inspect for poor connections at the passenger rear power window motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 32  Go to Step 31 
26 Repair the open or short to ground in the battery positive voltage circuit. Refer to Circuit Testing and Wiring Repairs .
Did you complete the repair?		 Go to Step 32  -
27 Repair the open in the rear power window switch ground circuit. Refer to Circuit Testing and Wiring Repairs .
Did you complete the repair?		 Go to Step 32  -
28 Replace the BCM. Refer to Control Module References for replacement, setup and programming.
Did you complete the repair?		 Go to Step 32  -
29 Replace the DDM. Refer to Control Module References for replacement, setup and programming.
Did you complete the repair?		 Go to Step 32  -
30 Replace the passenger rear power window switch. Refer to Rear Side Door Window Switch Replacement .
Did you complete the repair?		 Go to Step 32  -
31 Replace the passenger rear power window motor. Refer to Rear Side Door Window Regulator Replacement .
Did you complete the repair?		 Go to Step 32  -
32 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 2 
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