SERVICE MANUAL UPDATE-SEC.8A REMOTE KEYLESS ENTRY

MODELS AFFECTED: 1989 REGALS WITH REMOTE KEYLESS ENTRY (OPTION AUO)

Remote Keyless Entry diagnostic procedures in Section 8A pages 132-0 thru 132-8 are incorrect. Use the corrected schematic and diagnostic procedures attached when servicing the Remote Keyless Entry System.

TROUBLESHOOTING HINTS

Try the following checks before doing the System Diagnosis.

1. Check LUGGAGE COMPARTMENT Fuse.

2. Always check terminal contact before replacing any component.

3. If door locks operate from the transmitter, but not from the door lock switches, check continuity of door lock switches and associated wiring for an open or a short. Repair/replace as necessary.

4. If a second transmitter is available, try it. If it works, change the batteries in the first transmitter and try it again. If it still doesn't work, it is defective.

5. Check portable transmitter battery terminals. They should be clean and make good contact with the battery.

6. If in doubt as to the condition of the transmitter batteries, replace them with new ones. Measuring battery voltage with a DVOM may give misleading results.

KEYLESS ENTRY MODULE PROGRAMMING PROCEDURE

Do the following procedure whenever the Data Encoder Connector is grounded, the Keyless Entry Module is replaced, the portable transmitter is replaced or a second transmitter is added.

1. Jumper the Data Encoder connector to ground (all power door locks will lock and unlock)

2. Operate transmitter by pressing a single button once

3. To program for a second portable transmitter, operate transmitter 2 within 5 seconds of step 2 by pressing a single button once.

4. Disconnect Data Encoder jumper Connector

5. Verify that the portable transmitter(s) operate door locks and luggage compartment release.

CIRCUIT OPERATION

The remote keyless entry (RKE) control system allows the driver to operate the vehicle door locks and luggage compartment release from outside the car using a hand-held radio transmitter. The Transmitter operates in the UHF band; it sends coded signals to the Keyless Entry Module. The Keyless Entry Module detects and decodes the signals and issues signals to control the door locks and luggage compartment release. These systems can also be operated in the usual manner; for instance, the door locks will respond to the power door lock switches.

LOCK

When the LOCK button is pressed on the transmitter and the Keyless Entry Module receives a signal with a valid vehicle access code (VAC), the lock function sequence is performed. The Keyless Entry Module will lock all doors.

The Keyless Entry Module supplies battery voltage to the coil of the Lock Relay. The Lock Relay is energized, and battery voltage is supplied to the door lock motors. Ground for the LH Door Lock Motor is provided at Keyless Entry Module terminal B through internal contacts. Ground for the other door lock motor(s) is provided through the conacts in the Door Lock Relay. All door lock motors run to lock all doors.

UNLOCK

The unlock function is separated into two operations depending on how the UNLOCK button is pressed on the transmitter. If the UNLOCK button is pressed once, only the LH door is unlocked. If the UNLOCK button is pressed twice within 1 to 5 seconds, both doors will be unlocked.

When the UNLOCK button is pressed once on the transmitter and the Keyless Entry Module receives a signal with a valid VAC, the unlock function sequence is performed. The Keyless Entry Module will supply battery voltage to the LH Door Lock Motor via the TAN/ WHT 694 wire. The motor is grounded through the contacts in the Power Door Lock Relay. The LH Door Lock Motor runs to unlock the LH door.

If the UNLOCK button on the transmitter is pressed twice to unlock all doors, the Keyless Entry Module will activate the door unlock output at pin G. The Keyless Entry Module will then supply battery voltage to the coil of the unlock relay in the Power Door Lock Relay. The unlock relay is energized and closes its contacts. Battery voltage is supplied to the RH Door Lock Motor. The motor is grounded through the contacts in the Door Lock Relay. The motor runs to unlock the passenger's door.

LUGGAGE COMPARTMENT RELEASE

When the luggage compartment release button is pressed on the transmitter and the Keyless Entry Module receives a signal with a valid VAC, the Keyless Entry Module will supply battery voltage at its terminal H. This battery voltage is then applied to the Luggage Compartment Release Solenoid. The Luggage Compartment Release Solenoid is energized and the Luggage Compartment Lid is released. If the Ignition Switch is ON, and the Transaxle Position Switch is not in PARK battery voltage is not supplied to Keyless Entry Module terminal D, and the Luggage Compartment Lid will not open.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.