GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Corvette 🢒 Body and Accessories 🢒 Doors 🢒 DTC B2222-B2224

Circuit Description

The driver door switch signal circuits provide inputs to the driver door module (DDM) when a mirror select switch is activated. These inputs allow the DDM to detect a LH or RH mirror request. The DDM provides power and ground to the mirror select switches. When a mirror select switch is activated, ground is supplied through the mirror select switch to the signal circuit, which is pulled low. When the DDM detects low voltage on the signal circuit, it will command the mirror in the direction selected. The DDM controls RH mirror functions by sending mirror control messages to the passenger door module (PDM) on the serial data line and the PDM then commands the RH mirror. The DDM monitors both the LH and RH mirror select switch signal circuits to determine how long a ground has been applied. If the DDM detects that a ground is applied for greater than 20 seconds, a DTC is set.

Conditions for Setting the DTC
    • The DDM detects a short to ground on a mirror select switch signal circuit.
    • Condition must be present for greater than 20 seconds.

Action Taken When the DTC Sets
    • Stores a history DTC B2222 or B2224 in DDM memory.
    • These DTCs can only be set as a history code even if the malfunction is current.
    • No driver warning message will be displayed for these DTCs.

Conditions for Clearing the DTC

The DDM no longer detects a short to ground on a mirror select switch signal circuit for longer than 20 seconds, and:

    • The DTC is cleared using the IPC clearing feature, or
    • The DTC is cleared using a scan tool.

Diagnostic Aids
    • The following conditions may cause an intermittent malfunction:
       - There is an intermittent short to ground on a mirror select switch signal circuit.
       - The mirror select switch is shorted to ground internally or is sticking.
       - The mirror select switch was pressed for longer than 20 seconds.
    • If the DTC does not reset after the code is cleared, then the problem may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description

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

  1. Tests for the normal state of the mirror select switch using a scan tool. The scan tool will display the normal state as Inactive, and Active when the switch is activated.

    2.

  2. Tests if the DDM is able to detect a change in mirror select switch state. The scan tool will display the normal state as Inactive, and Active when the switch is activated.

    3.

  3. Tests for a stuck or shorted mirror select switch. If the mirror select switch is stuck or shorted, the state will change from Active to Inactive when the mirror select switch is disconnected.

    4.

  4. Tests for a short to ground in the mirror select switch signal circuit.

Step

Action

Yes

No

Schematic Reference: Door Control Module Schematics

Connector End View Reference: Power Door Systems Connector End Views

1

Did you perform the Door Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Door Systems

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the appropriate mirror select switch parameter in the Left Door Control Module Inputs data list.

Does the scan tool display Inactive?

Go to Step 3

Go to Step 4

3

  1. Activate the appropriate mirror select switch.
  2. With a scan tool, observe the appropriate mirror select switch parameter in the Left Door Control Module Inputs data list.

Does the mirror select switch parameter change state?

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

Go to Step 4

4

  1. Turn OFF the ignition.
  2. Disconnect the driver door switch.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the appropriate mirror select switch parameter in the Left Door Control Module Inputs data list.

Does the scan tool display Inactive?

Go to Step 7

Go to Step 5

5

Test the appropriate signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 6

6

Inspect for poor connections at the harness connector of the driver door 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 10

Go to Step 8

7

Inspect for poor connections at the harness connector of the driver door switch. 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 10

Go to Step 9

8

Replace the driver door module. Refer to Door Control Module Replacement .

Did you complete the replacement?

Go to Step 10

--

9

Replace the driver door switch. Refer to Front Door Switch Replacement .

Did you complete the replacement?

Go to Step 10

--

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