GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Blazer - 4WD - RHD 🢒 Body and Accessories 🢒 Seats 🢒 DTC B2356 Driver Front Vert. Sensor Performance

For wiring diagrams, refer to

Seat Adjuster Memory Module, Transducers and Motors


Object Number: 548067 Size: FS
Power Seat Systems Components
Memory Seat Circuit Description
Power, Ground and Seat Adjuster Memory Module
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
 .

Circuit Description

The seat adjuster memory module monitors the seat front height motor position through the seat front height transducer CKT 557 (ORN/BLK). The seat adjuster memory module also sends a reference voltage on CKT 569 (RED) to CKT 557B (RED) and provides a sensor ground, CKT 569 (BLK) to CKT 557A (BLK).

Conditions for Setting the DTC

The DTC will set if the seat adjuster memory module detects that the seat front height sensor output voltage is either too high or too low due to the following:

    • An open circuit
    • A short to ground
    • A short to power
    • A defective seat height transducer

Conditions for Clearing the DTC
    • A history DTC will clear after 100 consecutive fault free ignition cycles.
    • Use a scan tool in order to clear history and current DTCs.

Diagnostic Aids

One or more of the following conditions could be the cause of an intermittent failure:

    • A poor connection
    • A break in the wire insulation that exposes the internal wire
    • A wire broken inside the insulation

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step inspects for current DTCs.

    2.

  2. This step locates and repairs open(s) in the wiring between the seat front height transducer and the seat adjuster memory module.

    3.

  3. This step locates and repairs sort(s) to ground in the wiring between the seat front height transducer and the seat adjuster memory module.

    4.

  4. This step verifies that the seat adjuster memory module is supplying the reference voltage to the seat front height transducer.

    5.

  5. This step replaces a defective seat front height transducer.

    6.

  6. This step replaces a defective seat adjuster memory module.

Step

Action

Value(s)

Yes

No

1

Did you perform the Power Seat Systems Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Power Seat Systems

2

  1. Turn the ignition and start switch to the OFF position.
  2. Install the scan tool.
  3. Turn the ignition and start switch to the RUN position.
  4. Using the scan tool, clear the DTCs. Refer to Diagnostic Trouble Code (DTC) Clearing .
  5. Operate the seat adjuster memory module controls.

Does DTC B2356 reset?

--

Go to Step 3

Go to Diagnostic System Check - Power Seat Systems

3

  1. Disconnect the seat adjuster memory module and the sensor.
  2. Test the following seat front height transducer circuits for an open:
    3. • CKT 557B (RED)
    • CKT 557 (ORN/BLK)
    • CKT 557A (BLK)
    • CKT 569 (BLK)

Refer to Circuit Testing and Wiring Repairs in wiring systems.

Did you find and correct the condition?

--

 

Go to Step 4

4

  1. Disconnect the seat adjuster memory module.
  2. Test the following seat front height transducer circuits for a short to ground:
    3. • CKT 557B (RED)
    • CKT 557 (ORN/BLK)
    • CKT 557A (BLK)
    • CKT 569 (BLK)

Refer to Circuit Testing and Wiring Repairs in wiring systems.

Did you find and correct the condition?

--

Go to Diagnostic System Check - Power Seat Systems

Go to Step 5

5

  1. Reconnect the seat adjuster memory module connector.
  2. Disconnect the seat front height transducer.
  3. Test the seat front height transducer circuit CKT 557B (RED) for voltage.

Refer to Circuit Testing in wiring systems.

Does the voltage equal the specified value?

5 V

Go to Step 6

Go to Step 7

6

Replace the seat front height transducer. Refer to Front Seat Adjuster Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - Power Seat Systems

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7

Replace the seat adjuster memory module. Refer to Memory Seat Control Module Replacement .

Is the repair complete?

 

Go to Diagnostic System Check - Power Seat Systems

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