B1750

DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B1735
- Driver Seat Front Up Switch Circuit

DTC B1740
- Driver Seat Front Down Switch Circuit

DTC B1745
- Driver Seat Rear Up Switch Circuit

DTC B1750
- Driver Seat Rear Down Switch Circuit

DTC B1755
- Driver Seat Assembly Forward Switch Circuit

DTC B1760
- Driver Seat Assembly Rearward Switch Circuit

DTC B1815
- Driver Seat Recline Forward Switch Circuit

DTC B1820
- Driver Seat Recline Rearward Switch Circuit

Diagnostic Fault Information






Circuit/System Description

The seat adjuster switches are inputs to the memory seat module (MSM). The seat module supplies the adjuster switch assembly with a battery positive switch supply circuit and monitors the switch signal circuits. In an inactive state the switch signal circuits are floating and when a switch is pressed the signal circuit is closed to the switch power circuit within the adjuster switch assembly. When battery voltage is present on the switch signal circuit the seat module determines the switch status to be active.

Conditions for Running the DTC

The battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

A switch signal circuit to the seat module is active for more than 60 seconds.

Action Taken When the DTC Sets

The seat module will disable the seat adjuster function for which the DTC has set.

Conditions for Clearing the DTC

* This DTC will clear on current status after the condition for setting the fault is corrected.
* A history DTC will clear after 100 consecutive ignition cycles without a fault present.

Circuit/System Verification

Ignition ON, observe the scan tool seat adjuster switch parameters while operating each adjuster switch in both directions. The reading should change between Inactive and the desired direction.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the seat adjuster switch.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal E and ground.

^ If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

3. Verify the scan tool switch parameter is Inactive.

^ If not the specified value, test the affected signal circuit terminal listed for a short to voltage. If the circuit tests normal, replace the memory seat module.

* Recline forward terminal F
* Recline rearward terminal A
* Horizontal forward terminal D
* Horizontal rearward terminal C
* Rear down terminal G
* Rear up terminal J
* Front up terminal K
* Front down terminal H

4. Install a 3A fused jumper wire between the affected signal circuit terminal listed and the B+ circuit terminal E. Verify the scan tool switch parameter is the desired direction.

* Recline forward terminal F
* Recline rearward terminal A
* Horizontal forward terminal D
* Horizontal rearward terminal C
* Rear down terminal G
* Rear up terminal J
* Front up terminal K
* Front down terminal H

^ If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the memory seat module.

5. If all circuits test normal, test or replace the seat adjuster switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Power Seat Switch Replacement