Diagnostic Instructions
DTC Descriptor
DTC U1401: No Communication with MSM (Memory Seat and
Mirror Module)
Circuit/System Description
The SIM continuously sends a communication signal to the MSM. Upon receiving
the signal, the MSM sends a reply signal, confirming that it can communicate.
Conditions for Running the DTC
The SIM is active.
Conditions for Setting the DTC
The SIM does not receive a response from the MSM for 10 or more consecutive
seconds.
Action Taken When the DTC Sets
The memory recall function is disabled.
Conditions for Clearing the DTC
| • | The current DTC will clear when the SIM receives a communication reply
from the MSM. |
| • | The history DTC will clear after 50 fault-free ignition cycles
have occurred. |
Reference Information
Schematic Reference
Driver Seat Schematics
.
Connector End View Reference
Component Connector End Views
.
Electrical Information Reference
Scan Tool Reference
Control Module References
Circuit/System Testing
- Disconnect the A154 SIM connector, and the A21-X3 MSM connector.
- Using a DMM test the SIM; position 1, position 2, position 3,
mirror dip, UART, module wake-up, power and ground circuits for short to ground or
an open/high resistance.
| ⇒ | If the circuits do not test normal, repair or replace the effected circuit(s). |
| ⇒ | If the circuits test normal, replace the MSM. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Memory Seat Control Module Replacement
.
