GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2006 🢒 GMC Sierra Denali 🢒 Restraints 🢒 SIR 🢒 DTC B1722

Circuit Description

The driver door module (DDM) and passenger door module (PDM) switch the mirror fold motor control circuits to battery voltage and ground in response to mirror extend or retract command.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1722 Mirror Power Fold Control Circuit

Conditions for Running the DTC
    • Battery voltage must be between 9-16 volts.
    • The ignition switch is in the ON position.
    • A mirror extend or retract function must be active.

Conditions for Setting the DTC

When the DDM or PDM switch the mirror fold motor control circuits to battery voltage and ground and one of the mirror fold motor control circuits are shorted to ground, shorted to battery or open.

Action Taken When the DTC Sets

The DDM or PDM will stop suppling battery voltage and ground to the mirror fold motor and the folding mirrors will be inoperative.

Conditions for Clearing the DTC

When the fault is no longer present, the door module changes the current DTC to a history DTC. The door module will clear the history DTC after 50 fault free ignition cycles, or in response to a scan tool command.

Step

Action

Value(s)

Yes

No

Schematic Reference: Outside Rearview Mirror Schematics

Connector End View Reference: Power Door Systems Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

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Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Place the mirror select switch in the neutral/fold position.
  4. Place the mirror direction switch in both the left/extend and right/retract positions.

Does DTC B1722 set as a current DTC?

--

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3
  1. Connect a test lamp to a good ground.
  2. Backprobe both of the mirror fold motor control circuits one at a time with the test lamp.

Does the test lamp illuminate at either test point?

--

Go to Step 6

Go to Step 4

4
  1. Connect a test lamp to battery voltage.
  2. Backprobe both of the mirror fold motor control circuits one at a time with the test lamp.

Does the test lamp illuminate at either test point?

--

Go to Step 6

Go to Step 5

5
  1. Disconnect the power mirror.
  2. Test for continuity through the mirror fold motor and the mirror fold motor control circuits.

Is there continuity?

--

Go to Step 7

Go to Step 6

6

Inspect for poor connections at the harness connector of the power mirror. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 10

Go to Step 8

7

Inspect for poor connections at the harness connector of the appropriate door module. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 10

Go to Step 9

8

Replace the appropriate power mirror. Refer to Outside Rearview Mirror Replacement .

Did you complete the replacement?

--

Go to Step 10

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9

Replace the appropriate door module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

--

Go to Step 10

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10
  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