B1835
DTC B1830 or B1835
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B1830 01
-
Left Front Seat Lumbar Forward Switch Circuit Short to Battery
DTC B1835 01
-
Left Front Seat Lumbar Rearward Switch Circuit Short to Battery
Diagnostic Fault Information
Circuit/System Description
When the lumbar switches are pressed, battery voltage is applied through the switch signal circuit to the memory seat module (MSM). The MSM interprets the signal and commands the lumbar motor to move in response to the switch signals.
Conditions for Running the DTC
The MSM must be powered.
Conditions for Setting the DTC
* If a lumbar switch circuit is active in one direction and the switch for the opposite direction is pressed, this DTC will set.
* A short to voltage on a switch signal circuit.
Action Taken When the DTC Sets
* A motor output driven in response to a switch considered failed, is deactivated for both directions.
* All memory recall commands are ignored.
* The MSM will respond to any other switch signal that has not set a DTC.
Conditions for Clearing the DTC
* The current DTC will clear and set the code to history, 3 seconds after the fault is no longer present and the ignition is cycled OFF then back to ACC or RUN.
* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.
Reference Information
Schematic Reference
Driver Seat Schematics Driver Seat Schematics
Connector End View Reference
Component Connector End Views A/C Compressor Clutch
Description and Operation
Power Seats System Description and Operation Power Seats System
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Memory Seat Module lumbar switch parameters while pressing and releasing the lumbar switch in both directions. The reading should change between Inactive and Active
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the lumbar adjuster switch.
2. Ignition ON, verify the scan tool lumbar switch parameters listed below are Inactive.
* Lumbar Forward Switch
* Lumbar Rearward Switch
• If not the specified value, test the appropriate signal circuit listed below for a short to voltage. If the circuit tests normal, replace the MSM.
* Lumbar forward switch terminal B
* Lumbar rearward switch terminal E
3. If all circuits test normal, test or replace the lumbar adjuster switch.
Component Testing
1. Ignition OFF, disconnect the harness connector at the lumbar adjuster switch.
2. Test for infinite resistance between the B+ terminal D and each lumbar direction signal terminal listed below and the with the switch in the open position.
* Lumbar horizontal forward switch terminal B
* Lumbar horizontal rearward switch terminal E
• If not the specified value, replace the lumbar adjuster switch.
3. Test for less than 1 ohms between the B+ terminal D and each lumbar direction signal terminal listed below and the with the switch in the closed position.
* Lumbar horizontal forward switch terminal B
* Lumbar horizontal rearward switch terminal E
• If greater than the specified range, replace the lumbar adjuster switch.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Driver Seat Lumbar Control Switch Replacement (AQ9) Driver Seat Lumbar Control Switch Replacement (AQ9)Driver Seat Lumbar Control Switch Replacement (W2E) Driver Seat Lumbar Control Switch Replacement (W2E)
* Passenger Seat Lumbar Control Switch Replacement (W2E) Passenger Seat Lumbar Control Switch Replacement (W2E)Passenger Seat Lumbar Control Switch Replacement (AQ9) Passenger Seat Lumbar Control Switch Replacement (AQ9)
* Control Module References Control Module References for MSM replacement, programming and setup