GM Service Manual Online
For 1990-2009 cars only

Object Number: 500894  Size: SF
Keyless Entry Schematics
Keyless Entry Components
Keyless Entry System Description

Circuit Description

The remote function actuator (RFA) module performs this test every time the module processes a message from a transmitter.

Conditions for Setting the DTC

The RFA module sets this DTC if the module receives a transmission from an out of sync transmitter.

Action Taken When the DTC Sets

    • The RFA module stores a DTC B3108 in current memory.
    • No driver warning message is displayed for this DTC.

Conditions for Clearing the DTC

The RFA module clears this DTC after a transmission is received from a valid synchronized transmitter.

Diagnostic Aids

This DTC will stay in memory as current (then history, until cleared) until the module receives a valid transmission from the remote function actuator (RFA) transmitters.

Step

Action

Value(s)

Yes

No

1

Did you perform the Remote Keyless Entry Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Remote Keyless Entry

2

  1. Hold the transmitter within the range of the vehicle.
  2. Press and hold the lock and unlock buttons on the transmitter for 8 seconds.
  3. Repeat steps 1 and 2 with the second transmitter.
  4. Clear DTC B3108 from the remote function actuator (RFA) module.
  5. Cycle the transmitter buttons.

Did DTC  B3108 return?

--

Go to Step 3

Go to Diagnostic System Check - Remote Keyless Entry

3

Replace the RFA module. Refer to Remote Control Door Lock Receiver Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - Remote Keyless Entry

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