DTC B2104 Rear Vertical Up Switch Failed Eldorado
Circuit Description
The memory seat module (MSM) receives an input from the LH seat switch rear vertical switch when the switch is actuated. When the rear vertical switch is operated in the up direction, battery positive voltage (B+) is supplied to the MSM rear vertical up input via CKT 1519 (YEL). The MSM recognizes the input and tilts the rear of the seat in the up direction.
Conditions for Setting the DTC
| • | When the rear vertical up switch is active for 30 seconds after motion has ceased, the switch will be considered shorted and the DTC will set. |
| • | If the seat rear vertical position sensor DTC B2116 is current and the rear vertical up switch is active for 30 seconds, the switch will be considered shorted and the DTC will set. |
| • | DTC B2104 will set only if DTC B1982 MSM or DTC B1983 MSM is not current. |
Action Taken When the DTC Sets
| • | The MSM will not tilt the rear of the seat in the up 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| • | The MSM sees that the rear vertical up switch is no longer active.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 entire 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 B2104 will set again if there is a short in the wiring or there is an internal MSM problem. DTC B2104 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 B2104 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 LH seat switch. Refer to Power Seat Switch Replacement . Is the LH seat switch replacement complete? | -- | -- | |
6 | Repair the short to battery positive voltage (B+) in CKT 1519 (YEL). Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | -- | |
Are all DTCs cleared? | -- | -- |
DTC B2104 Rear Vertical Up Switch Failed DeVille
Circuit Description
The memory seat module (MSM) receives an input from the left seat switch rear vertical switch when the switch is actuated. When the rear vertical switch is operated in the up direction, battery positive voltage (B+) is supplied to the MSM rear vertical up input via CKT 1519 (YEL). The MSM recognizes the input and tilts the rear of the seat in the up direction.
Conditions for Setting the DTC
| • | When the rear vertical up switch is active for 30 seconds after motion has ceased, the switch is considered shorted and the DTC sets. |
| • | If the seat rear vertical position sensor DTC B2116 is current and the rear vertical up switch is active for 30 seconds, the switch is considered shorted and the DTC sets. |
| • | DTC B2104 sets only if DTC B1982 MSM or DTC B1983 MSM is not current. |
Action Taken When the DTC Sets
| • | The MSM does not tilt the rear of the seat in the up direction. |
| • | The MSM continues responding to valid inputs from the other manual switches. |
| • | All memory recall function commands are ignored for all directions. |
Conditions for Clearing the DTC
| • | The MSM sees that the rear vertical up 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 entire 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 B2104 will set again if there is a short in the wiring or there is an internal MSM problem. DTC B2104 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 B2104 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 LH seat switch. Refer to Power Seat Switch Replacement . Is the LH seat switch replacement complete? | -- | -- | |
6 | Repair the short to battery positive voltage (B+) in CKT 1519 (YEL). Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | -- | |
Are all DTCs cleared? | -- | -- |
