Diagnostic Instructions

DTC Descriptors

DTC B1390 01: Button 1 Circuit Short to Battery

DTC 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

Reference Information

Schematic Reference

Driver Seat Schematics

Connector End View Reference

Component Connector End Views

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.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the memory seat switch.
2. Ignition ON, verify the scan tool SIM Input parameters listed below are Inactive:

•	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.

3. If all circuits test normal, test or replace the memory seat switch.

Component Testing

1. Ignition OFF, disconnect the harness connector at the memory seat switch.
2. Test for infinite resistance between the 12 V reference terminal 6 and each signal terminal listed below with the switch in the open 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.

3. 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

⇒	If greater than the specified range, replace the memory seat switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.