GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The rear side door actuator control module uses an optical sensor to monitor the sliding door position at all times. The optical sensor requires a 5 volt reference and reference return from the rear side door actuator control module. There are 2 signal circuits from the optical sensor to the rear side door actuator control module. The optical sensor sends pulses through both signal circuits to the power sliding door module whenever the sliding door is in motion. The optical sensor pulses allow the rear side door actuator control module to calculate the position of the sliding door at all times. The optical sensor signal circuits switch from 0.01 to 4.5 volts as the sliding door is moving.

Conditions for Running the DTC

A DTC 13 may be set whenever the sliding door is in motion.

Conditions for Setting the DTC

The optical sensor input to the rear side door actuator control module indicates that the sliding door is out of its normal operating range.

Action Taken When the DTC Sets

The rear side door actuator control module sets DTC 13.

Conditions for Clearing the DTC

All stored DTCs are cleared whenever the on-board diagnostic modes are exited.

Diagnostic Aids

    • Inspect the optical sensor connector and terminals for damage.
    • Inspect the optical sensor pigtail harness for damage.
    • Inspect the optical sensor for proper installation and a secure mount to the actuator motor housing.

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

  1. Tests the rear side door actuator control module for the optical sensor 5 volt reference and ground.

  2. Tests the optical sensor signal circuit. While the door is moving at the approximate power operating speed the average voltage measured should be 2 to 3 volts.

  3. Tests the optical sensor signal circuit. While the door is moving at the approximate power operating speed the average voltage measured should be 2 to 3 volts.

Step

Action

Value(s)

Yes

No

Schematic Reference: Sliding Door Schematics

Connector End View Reference: Power Door Systems Connector End Views

1

Did you perform the Power Door Systems Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Door Systems

2

  1. Turn the power sliding door ON/OFF switch to the OFF position to exit the on-board diagnostic modes.
  2. Manually close the power sliding door.
  3. Using a digital voltmeter backprobe the optical sensor connector from the 5 volt reference circuit to the low reference circuit.
  4. Manually open the power sliding door.

Is the voltage the specified value?

5 V

Go to Step 3

Go to Step 7

3

  1. Using a digital voltmeter backprobe the optical sensor from the terminal 3 signal circuit to the low reference circuit.
  2. Slowly move the power sliding door from open to closed.

Is the voltage the within specified values?

0.01-4.5 V

Go to Step 4

Go to Step 5

4

  1. Using a digital voltmeter backprobe the optical sensor from the terminal 4 signal circuit to the low reference circuit.
  2. Slowly move the power sliding door from closed to open.

Is the voltage the within specified values?

0.01-4.5 V

Go to Step 7

Go to Step 5

5

Inspect and if possible repair any damage to the optical sensor pigtail harness or connector. Refer to Wiring Repairs and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 9

Go to Step 6

6

Replace the actuator motor and clutch assembly. Refer to Power Sliding Door Motor Clutch Replacement .

Is the repair complete?

--

Go to Step 9

--

7

Inspect for poor connections at the rear side door actuator control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 9

Go to Step 8

8

Replace the rear side door actuator control module. Refer to Rear Side Door Actuator Control Module Replacement .

Is the repair complete?

--

Go to Step 9

--

9

Re-initialize the power sliding door and operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2