Circuit Description
The LH Front Power Window Switch receives an input from the memory function switch memory 1 switch when the switch is actuated. The LH Front Power Window Switch recognizes the input and sends a message on the Simple Bus Interface (SBI) to the LH Front Door Module (LFDM) indicating that the memory 1 button has been pressed. The LFDM then sends a message via the Class 2 Serial Data Line to the Memory Seat Module (MSM), the Steering Column Tilt/Telescoping Module (TTM), and the Radio (IRC) indicating that the memory 1 button has been pressed.
Conditions for Setting the DTC
| • | When the memory 1 switch is active for 30 seconds continuously, the switch will be considered shorted and the DTC will set. |
| • | DTC B2240 will set only if DTC B1982 DDM or DTC B1983 DDM is not current. |
Action Taken When the DTC Sets
| • | The LFDM will no longer respond to memory 1 switch inputs. |
| • | The LFDM will continue to respond to valid inputs from the other memory function switches. |
Conditions for Clearing the DTC
| • | The LFDM sees that the memory 1 switch is no longer active. |
| • | Use the On-Boards clearing DTCs feature. |
| • | Use a scan tool. |
Test Description
The numbers below refer to the step numbers on the diagnostic table:
-
Perform the Power Door Diagnostic System Check before continuing with the diagnosis of this DTC.
-
Determines whether there is a stuck switch or a short in the wiring input to the memory seat module (MSM). DTC B2240 will set again if there is a short in the wiring or there is an internal LH front power window switch condition. DTC B2240 will not set again if there is a stuck switch because the switch has been disconnected from the LH front power window switch input.
-
Determines whether there is a short in the input wiring to the LH front power window switch.
-
Clear all DTCs after the repair procedure is complete.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Was the Door Systems Diagnostic System Check performed? | -- | Go to Step 2 | ||
After 30 seconds, does DTC B2240 reset? | -- | Go to Step 3 | Go to Step 5 | |
Test for a short or a short to ground between CKT 615 (WHT) and CKT 351 (BLK/WHT). Is the circuit OK? | -- | Go to Step 4 | Go to Step 6 | |
4 | Replace the LH front power window switch. Refer to Front Door Switch Replacement . Did you complete the replacement? | -- | Go to Step 7 | -- |
5 | Replace the memory function switch. Refer to Front Door Switch Replacement . Did you complete the replacement? | -- | Go to Step 7 | -- |
6 | Repair the short in the suspect wiring. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 7 | -- |
Are all DTCs cleared? | -- | -- |
