DTC B1815 Driver Recline Forward Switch CKT Malf A45 with AL2
Circuit Description
The memory seat module (MSM) receives an input from the seat switch recline switch when the switch is actuated. When the recline switch is operated in the forward direction, battery positive voltage (B+) is supplied to the MSM recline forward input via CKT 276 (LT GRN). The MSM recognizes the input and moves the seat back in the forward direction.
Conditions for Setting the DTC
| • | When the recline forward switch is active for 30 seconds after motion has ceased, the switch will be considered shorted and the DTC will set. |
| • | If the seat recline position sensor DTC B1825 is current and the recline forward switch is active for 30 seconds, the switch will be considered shorted and the DTC will set. |
| • | DTC B1815 will set only if DTC B1327 MSM or DTC B1328 MSM is not current. |
Action Taken When the DTC Sets
| • | The MSM will not recline the seat back in the forward direction. |
| • | The MSM will continue to respond to valid inputs from the other manual switches. |
| • | All memory recall function commands will be ignored for all directions. |
Conditions for Clearing the DTC
| • | The MSM sees that the recline forward switch is no longer active.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 Seat Systems Diagnostic System Check before continuing with the diagnosis of this DTC.
-
Determines whether there is a stuck switch or a short to battery positive voltage (B+) in the wiring input to the memory seat module (MSM). DTC B1815 will set again if there is a short in the wiring or there is an internal MSM problem. DTC B1815 will not set again if there is a stuck switch because the switch has been disconnected from the memory seat module (MSM) input.
-
Determines whether there is a short to battery positive voltage (B+) in the input wiring to the MSM.
-
Clear all DTCs after the repair procedure is complete.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Was the entire Power Seat Systems Diagnostic System Check performed? | -- | |||
After 30 seconds, does DTC B1815 reset? | -- | |||
Is the voltage within the specified range? | 10-15 V | |||
4 | Replace the memory seat module (MSM). Refer to Memory Seat Control Module Replacement . Is the MSM replacement complete? | -- | -- | |
5 | Replace the seat switch. Refer to Power Seat Switch Replacement . Is the seat switch replacement complete? | -- | -- | |
6 | Repair the short to battery positive voltage (B+) in CKT 276 (LT GRN). Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | -- | |
Are all DTCs cleared? | -- | -- |
DTC B1815 Driver Recline Forward Switch CKT Malf A45 with AC9
Circuit Description
The memory seat module (MSM) receives an input from the seat switch recline switch when the switch is actuated. When the recline switch is operated in the forward direction, battery positive voltage (B+) is supplied to the MSM recline forward input via CKT 276 (LT GRN). The MSM recognizes the input and moves the seat back in the forward direction.
Conditions for Setting the DTC
| • | When the recline forward switch is active for 30 seconds after motion has ceased, the switch will be considered shorted and the DTC will set. |
| • | If the seat recline position sensor DTC B1825 is current and the recline forward switch is active for 30 seconds, the switch will be considered shorted and the DTC will set. |
| • | DTC B1815 will set only if DTC B1327 MSM or DTC B1328 MSM is not current. |
Action Taken When the DTC Sets
| • | The MSM will not recline the seat back in the forward direction. |
| • | The MSM will continue to respond to valid inputs from the other manual switches. |
| • | All memory recall function commands will be ignored for all directions. |
Conditions for Clearing the DTC
| • | The MSM sees that the recline forward 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 Seat Systems Diagnostic System Check before continuing with the diagnosis of this DTC.
-
Determines whether there is a stuck switch or a short to battery positive voltage (B+) in the wiring input to the memory seat module (MSM). DTC B1815 will set again if there is a short in the wiring or there is an internal MSM problem. DTC B1815 will not set again if there is a stuck switch because the switch has been disconnected from the memory seat module (MSM) input.
-
Determines whether there is a short to battery positive voltage (B+) in the input wiring to the MSM.
-
Clear all DTCs after the repair procedure is complete.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Was the entire Power Seat Systems Diagnostic System Check performed? | -- | |||
After 30 seconds, does DTC B1815 reset? | -- | |||
Is the voltage within the specified range? | 10-15 V | |||
4 | Replace the memory seat module (MSM). Refer to Memory Seat Control Module Replacement . Is the MSM replacement complete? | -- | -- | |
5 | Replace the seat switch. Refer to Power Seat Switch Replacement . Is the seat switch replacement complete? | -- | -- | |
6 | Repair the short to battery positive voltage (B+) in CKT 276 (LT GRN). Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | -- | |
Are all DTCs cleared? | -- | -- |
