Circuit Description
The memory seat module has two battery voltage supply circuits. The battery 1 voltage supply circuit is used to provide power for the memory seat module logic and internal driver operation. The battery 2 voltage supply circuit is used to provide a high current supply for the memory seat module output devices.
Conditions for Running the DTC
The battery 1 circuit voltage to the memory seat module is within 6.5-26.5 volts.
Conditions for Setting the DTC
| • | The memory seat module detects battery 2 voltage under 8.5 volts or over 16.3 volts. |
| • | The condition must be present for 2 seconds. |
Action Taken When the DTC Sets
| • | A history DTC is stored in the memory seat module. |
| • | Memory seat module DTCs can only be set as a history code even if the fault is current. |
| • | No driver warning message will be displayed for these DTCs. |
Conditions for Clearing the DTC
Memory seat module DTCs may be cleared only by using a scan tool or the IPC clearing DTCs feature.
Diagnostic Aids
| • | A DTC B0846 can be the result of a short to ground in an adjuster motor or control circuit, first diagnose a DTC B2002, B2007, or B2012, if present. |
| • | Inspect the battery and charging system for proper operation. |
| • | If the fault is not current, the problem may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Memory Seats Schematics Connector End View Reference: Power Seat Connector End Views | ||||
1 | Did you perform the Power Seat Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Is the voltage within the specified values? | 8.5-16.3 V | Go to Step 3 | Go to Step 4 |
Operate the seat adjuster motors and telescoping steering column in both directions. Does the battery 2 voltage remain within the specified values? | 8.5-16.3 V | Go to Diagnostic Aids | Go to Step 4 | |
4 | Test the battery 2 supply circuit for high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 7 | Go to Step 5 |
5 | Test the memory seat module ground circuit for high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 7 | Go to Step 6 |
6 | Replace the memory seat module. Refer to Memory Seat Control Module Replacement . Is the repair complete? | -- | Go to Step 7 | -- |
7 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
