DTC B2272 Left Mirror Motor Circuit. Chevrolet Corvette 2000

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2000 🢒 Corvette 🢒 DTC 🢒 DTC B2272 Left Mirror Motor Circuit

Power and Grounding Components
Door Control Module Schematics

Circuit Description

The LH Door Control Module (LDCM) provides the LH mirror motor control output functions. This output control allows the LDCM to command the LH power mirror in the horizontal or vertical position. The LH door switch circuit provides an input to the LDCM when the mirror switch is pressed UP, DOWN, LEFT or RIGHT. When the LDCM detects an active mirror command from the LH mirror switch, the LDCM will command the LH mirror motor in the appropriate direction. The LDCM accomplishes this by applying a ground or voltage to the LH vertical mirror motor control circuit or LH horizontal mirror motor control circuit, depending on the desired mirror position. The LDCM monitors the amount of current draw on both LH the horizontal and vertical mirror motor control circuits. If the current draw is not within the acceptable range, a malfunction is present and a DTC will set.

Conditions for Setting the DTC

•	The LDCM commands the horizontal or vertical mirror motor ON.

•	The LDCM detects a short to ground or voltage condition in the LH horizontal or vertical mirror motor control circuit.

•	The LDCM detects battery 1 voltage under 7.9 volts with the LH horizontal or vertical mirror motor is applied.

•	Condition must be present for 2 seconds.

Action Taken When the DTC Sets

•	Stores a history DTC B2272 in the LDCM 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 LDCM no longer detects a short to ground or voltage condition in the LH horizontal or vertical mirror motor control circuit for longer than 2 seconds.

•	Use the IPC clearing DTCs feature.

•	Use a scan tool.

Diagnostic Aids

•	The following conditions may cause an intermittent malfunction:

-	There is an intermittent short to voltage in the LH vertical or horizontal mirror motor control circuit.

-	The LH vertical or horizontal mirror motor is shorted internally.

•	If the horizontal or vertical motor circuit is shorted (to ground or voltage), the LH mirror will operate only in certain directions depending on what circuit was affected.

•	Using a scan tool, select LDCM inputs and monitor the mirror motor load while operating the mirror motor in all directions. If the scan tool displays the mirror motor load as 0, then check the mirror motor circuit for opens.

•	If the DTC does not reset after the code is cleared, then the problem may be intermittent. Perform the tests shown while moving related wiring and connectors. This can often cause the malfunction to occur. Refer to Intermittents and Poor Connections .

Test Description

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

Tests for excessive current draw in the LH horizontal mirror motor control circuit by using a scan tool to monitor battery 1 voltage.

Tests for excessive current draw in the LH vertical mirror motor control circuit by using a scan tool to monitor battery 1 voltage.

Tests the LH horizontal mirror motor control circuit output voltage.

Tests the LH vertical mirror motor control circuit output voltage.

Tests for a short to ground or voltage in the LH horizontal mirror motor control circuits.

Step	Action	Value(s)	Yes	No
1	Did you perform the Power Door Systems Diagnostic System Check?	--	Go to Step 2	Go to Diagnostic System Check - Power Door Systems
2	Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the Battery 1 parameter in the LH DCM data list. Operate the LH mirror LEFT and RIGHT while monitoring the Battery 1 voltage. Does the scan tool indicate that the Battery 1 voltage is less than the specified value when the LH mirror is operated LEFT and RIGHT?	7.9 V	Go to Step 4	Go to Step 3
3	With a scan tool, observe the Battery 1 parameter in the LH DCM data list. Operate the LH mirror UP and DOWN while monitoring the Battery 1 voltage. Does the scan tool indicate that the Battery 1 voltage is less than the specified value when the LH mirror is operated UP and DOWN?	7.9 V	Go to Step 5	Go to Diagnostic Aids
4	Turn OFF the ignition. Disconnect the LH mirror. Turn ON the ignition, with the engine OFF. Measure the voltage between both LH horizontal mirror motor control circuits. Operate the LH mirror LEFT and RIGHT. Does the voltage measure within the specified value?	10.0-14.0 V	Go to Step 9	Go to Step 6
5	Turn OFF the ignition. Disconnect the LH mirror. Turn ON the ignition, with the engine OFF. Measure the voltage between both LH vertical mirror motor control circuits. Operate the LH mirror UP and DOWN. Does the voltage measure within the specified value?	10.0-14.0 V	Go to Step 9	Go to Step 7
6	Test both the LH horizontal mirror motor control circuits for a short to ground or voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	--	Go to Step 10	Go to Step 8
7	Test both the LH vertical mirror motor control circuits for a short to ground or voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	--	Go to Step 10	Go to Step 8
8	Replace the LH DCM. Refer to Door Control Module Replacement . Did you complete the replacement?	--	Go to Step 10	--
9	Replace the LH mirror. Refer to Outside Rearview Mirror Replacement . Did you complete the replacement?	--	Go to Step 10	--
10	Use the scan tool in order to clear the DTCs. 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