For 1990-2009 cars

### 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 B2755 00: Driver Memory Select Switch Circuit Malfunction
DTC B2755 01: Driver Memory Select Switch Circuit Short to Battery
DTC B2755 02: Driver Memory Select Switch Circuit Short to Ground
DTC B2765 02: Seat Memory Set Switch Circuit Short to Ground

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Memory Seat Switch Signal | B2755 02 | 1 | B2755 01 | B2755 00
Memory Seat Switch Set Signal | B2765 02 | 2 | 2 | --
Ground - Memory Seat Adjuster Switch | -- | 1 | -- | --
1. Memory recall is inoperative 2. Memory set function is inoperative

### Circuit/System Description

Ground from the memory seat module is supplied at all times to the memory seat adjuster switch. When the memory recall switches are pressed, the appropriate signal circuit from the memory seat module is pulled low indicating the memory recall request. In response to this signal, the memory seat module commands the driver seat motors to move to the appropriate seat positions stored in memory.

### Conditions for Running the DTC

• | DTC B1327 must not be present.

• | Module battery voltage must be between 9 - 16 V.

### Conditions for Setting the DTC

• | If a memory switch continues to be active for 30 seconds after the last motor controlled by memory seat module reaches the end of its travel, the switch will be considered shorted and the memory seat module will set a switch DTC.

• | If a position sensor DTC is current and the associated switch is active for 30 continuous seconds, the switch will be considered shorted and the memory seat module will set a switch DTC.

### Actions Taken When the DTC Sets

• | Current and history codes are set.

• | All memory recall commands are ignored.

• | The memory seat module will respond to any other switch signal that has not set a DTC.

### Conditions for Clearing the DTCs

• | The current DTC will clear and set the code to history, when the fault is no longer present and the ignition is cycled OFF then back to ACC or RUN.

• | The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

### 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

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Ignition ON, observe the scan tool K40 Memory Seat Module memory seat switch parameters listed below while pressing and releasing the appropriate memory switch. The reading should change between Inactive and Memory 1 Memory 2, Memory 3, or Memory Set when the switch is pressed and released.

• | Memory Select Switch

• | Memory Set Switch

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the K47D memory seat adjuster switch.
2. Ignition On, test for 4.8 - 5.2 V between the signal circuit terminal 1 and ground.

⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K40 memory seat module

⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K40 memory seat module

3. Test for 4.8 - 5.2 V between the signal circuit terminal 6 and ground.

⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K40 memory seat module

⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K40 memory seat module

4. If all circuits test normal, test or replace the K47D memory seat adjuster switch.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for memory seat module replacement, setup, and programming