Circuit Description
The left front power door lock switch feeds switch signals to the left front power window switch over CKT 780 (RED/BLK) and CKT 781 (ORN/BLK). The left front power window switch converts the switch inputs to serial digital data and broadcasts the message out on the simple bus interface (SBI). The SBI, CKT 217 (LT BLU), provides a communications path from the driver' s door switch to the driver's door module (DDM). The DDM contains the following 2 types of software:
| • | Switch message decoding software |
| • | SBI diagnostic software |
The software enables the DDM to accept messages from the door switch and test the interface between the 2 components.
Conditions for Setting the DTC
| • | If either of the switch inputs for LOCK or UNLOCK remain closed continuously for 30 seconds, DTC B2220 sets. |
| • | DTC B1982 (battery voltage high) and DTC B1983 (battery voltage low) must not be current or the diagnostic will not run. |
Action Taken when the DTC Sets
The switch actuation will be ignored until the switch leaves the low state change of the lock switch input. The manual door lock levers and key locks will still function normally.
Conditions for Clearing the MIL/DTC
| • | This DTC will set from current to history when the door lock switch input cycles OFF or the power mode changes from OFF to RUN. |
| • | The history DTC will clear after 50 consecutive ignition cycles. |
| • | Use a scan tool in order to clear the history DTC. |
Diagnostic Aids
The scan tool can be selected in order to monitor driver door module (DDM) inputs and outputs, as well as view DTCs. The scan tool may be used in order to select the remote function actuator (RFA) inputs, outputs, and options.
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
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Perform the Door Diagnostic System Check prior to diagnosing DTC B2220.
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This step tests for the right front power door lock switch failing mechanically.
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This step tests for inputs to the driver door module (DDM).
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Did you perform the Power Door Diagnostic System Check? | -- | Go to Step 2 | ||
Is the left front power door lock switch mechanically stuck in the lock or the unlock position? | -- | Go to Step 5 | Go to Step 3 | |
Does the left front door lock switch display lock or unlock? | -- | Go to Step 4 | Go to Step 6 | |
Move the door lock switch to the UNLOCK position. Connect a DMM across the left front power lock switch terminals B and C. Move the door lock switch to the LOCK position. Is the resistance within the specified range for both switch positions? | 0-5ohms | Go to Step 7 | Go to Step 5 | |
5 | Replace the left front power door lock switch. Refer to Power Door Locks System Check Power Door Lock Switch Replacement. Is the repair complete? | -- | Go to Step 10 | -- |
6 | Replace the driver door module (DDM). Refer to Front Door Module Replacement . Is the repair complete? | -- | Go to Step 10 | -- |
Test CKT 780 (RED/BLK) for a short to ground. Is the circuit OK? | -- | Go to Step 9 | Go to Step 8 | |
8 | Repair the short to ground in CKT 780 (RED/BLK). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 10 | -- |
9 | Replace the left front power window switch. Refer to Front Side Door Window Switch Replacement . Is the repair complete? | -- | Go to Step 10 | -- |
10 |
Are all of the DTCs cleared? | -- | -- |
