GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Corvette 🢒 Body and Accessories 🢒 Doors 🢒 DTC B2226-B2234

Circuit Description

The driver door switch signal circuits provide inputs to the driver door module (DDM) when the mirror switch is activated. These inputs allow the DDM to detect a mirror direction request. The DDM provides both power and ground to the mirror switches. When a mirror switch is activated to the right, left, up or down position, ground is supplied through the mirror switch to the signal circuit, which is pulled low. When the DDM detects low voltage on the signal circuit, it will command the mirror to rotate in the direction selected. The DDM controls passenger mirror functions by sending mirror control messages to the passenger door module (PDM) on the serial data line and the PDM then commands the passenger mirror. The DDM monitors both the driver and passenger mirror 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 switch signal circuit.
    • Condition must be present for greater than 20 seconds.

Action Taken When the DTC Sets
    • Stores a history DTC B2226, B2228, B2232 or B2234 in DDM memory.
    • This DTC can only be set as a history code even if the malfunction is current.
    • No driver warning message will be displayed for this DTC.

Conditions for Clearing the DTC

The DDM no longer detects a short to ground on a mirror directional switch signal circuit for greater 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 in the mirror right, left, up or down switch signal circuit.
       - The mirror switch is shorted to ground internally or is sticking.
       - The mirror 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 right, left, up or down 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 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 switch. If the mirror switch is stuck or shorted, the state will change from Active to Inactive when the mirror switch is disconnected.

    4.

  4. Tests for a short to ground in the appropriate mirror 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 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 mirror switch.
  2. With a scan tool, observe the appropriate mirror switch parameter in the Left Door Control Module Inputs data list.

Does the mirror 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 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 of the mirror switch 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