Circuit Description
Battery Positive Voltage (B+) is supplied to the LH Front Door Module (LFDM) at the LFDM connector C1, terminal 11, CKT 640 (ORN). The LFDM monitors this voltage to determine if it is within a valid operating range.
Conditions for Setting the DTC
The Battery Positive Voltage (B+) level falls below 9 volts for approximately 1.2 seconds or more.
Action Taken When the DTC Sets
| • | Stores a DTC B1983 in the LFDM memory. |
| • | The LFDM will not respond to any manual or memory inputs when the voltage is less than 9 volts |
| • | No driver warning message will be displayed for this DTC. |
| • | The LFDM switch failure and position sensor failure DTCs will not set while DTC B1983 is current. |
Conditions for Clearing the DTC
| • | The Battery Positive Voltage (B+) level rises above 9.5 volts for approximately 1.2 seconds. |
| • | Use the On-Boards clearing DTCs feature. |
| • | Use a scan tool. |
Diagnostic Aids
The LFDM will not check for low Battery Positive Voltage (B+) during and for 2 seconds following the engine CRANK mode, this insures that DTC B1983 will not erroneously set.
Test Description
The numbers below refer to the step numbers on the diagnostic table:
-
Perform the Power Door System Diagnostic System Check before continuing with the diagnosis of this DTC.
-
Determines whether the malfunction is in the charging system or the LH Front Door Module (LFDM).
-
Clear all DTCs after the repair procedure is complete.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Was the Power Door System Diagnostic System Check performed? | -- | Go to Step 2 | ||
2 |
Does the DTC reset? | -- | Go to Step 3 | Go to Charging System Check in Engine Electrical |
Does Ignition 1 voltage measure within the specified range? | 10-15 V | Go to Step 4 | Go to Charging System Check in Engine Electrical | |
4 | Replace the LFDM. Refer to Door Control Module Replacement . Is the LFDM replacement complete? | -- | Go to Step 5 | -- |
Are all DTCs cleared? | -- | -- |
