Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category |
DTC Descriptors
DTC B1390 01: Button 1 Circuit Short to BatteryDTC B1400 01: Button 2 Circuit Short to Battery
DTC B1410 01: Button 3 Circuit Short to Battery
DTC B2765 01: Button M Circuit Short to Battery
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Seat Adjuster Memory Switch 12 Volt Reference | B3907 02, 1 | 1 | -- | -- |
Memory Seat Switch Signal 1 | 1 | 1 | B1390 01 | -- |
Memory Seat Switch Signal 2 | 1 | 1 | B1400 01 | -- |
Memory Seat Switch Signal 3 | 1 | 1 | B1410 01 | -- |
Memory Mirror Switch Signal M | 1 | 1 | B2765 01 | 1 |
1. Memory recall is inoperative | ||||
Circuit/System Description
Reference voltage from the seat interface module (SIM) is supplied at all times to the memory seat switch. When a memory recall switch is pressed, reference voltage is applied through the switch contacts and the signal circuit to the SIM indicating the memory recall request. The SIM serves as a interface and applies a reference voltage through the appropriate memory signal circuit to the memory seat module (MSM) indicating the memory seat request. The MSM then commands the driver seat motors and the exterior mirrors to move to the appropriate seat and mirror positions stored in memory.
Conditions for Running the DTC
The MSM is active.
Conditions for Setting the DTC
B1390 01
The SIM will set this DTC if it senses that the memory 1 switch signal is active for more than 50 seconds.
B1400 01
The SIM will set this DTC if it senses that the memory 2 switch signal is active for more than 50 seconds.
B1410 01
The SIM will set this DTC if it senses that the memory 3 switch signal is active for more than 50 seconds.
B2765 10
The SIM will set this DTC if it senses that the memory M switch signal is active for more than 50 seconds.
Action Taken When the DTC Sets
The memory recall function for the particular memory button is disabled.
Conditions for Clearing the DTC
| • | The current DTC will clear when the switch circuit setting the DTC is no longer active. |
| • | The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Memory Seats Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool SIM Input parameters listed below while pressing the appropriate memory 1, 2, 3, and M switches. The readings should change between Inactive and Active.
| • | Button 1 Input Status |
| • | Button 2 Input Status |
| • | Button 3 Input Status |
| • | Button M Input Status |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the memory seat switch.
- Ignition ON, verify the scan tool SIM Input parameters listed below are Inactive:
- If all circuits test normal, test or replace the memory seat switch.
| • | Button 1 Input Status |
| • | Button 2 Input Status |
| • | Button 3 Input Status |
| • | Button M Input Status |
| ⇒ | If not the specified value, test the appropriate signal circuit for a short to voltage. If the circuit tests normal, replace the SIM. |
Component Testing
- Ignition OFF, disconnect the harness connector at the memory seat switch.
- Test for infinite resistance between the 12 V reference terminal 6 and each signal terminal listed below with the switch in the open position:
- Test for less than 2 Ω between the 12 V reference terminal 6 and each signal terminal listed below with the appropriate switch in the closed position:
| • | Memory 1 terminal 1 |
| • | Memory 2 terminal 2 |
| • | Memory 3 terminal 3 |
| • | Memory M terminal 4 |
| ⇒ | If not the specified value, replace the memory seat switch. |
| • | Memory 1 terminal 1 |
| • | Memory 2 terminal 2 |
| • | Memory 3 terminal 3 |
| ⇒ | If greater than the specified range, replace the memory seat switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for SIM replacement, setup, and programming |
