C: Illuminated Entry Request Inoperative

C: ILLUMINATED ENTRY REQUEST INOPERATIVE

The GEM module ( Section 18-04A ) controls the interior lights with the illuminated entry function.

The receiver assembly sends pulses on the GEM illuminated entry circuit to request the illuminated entry begin or end. Circuit 1013 (BR/LG) is normally pulled up by the GEM module. The receiver assembly pulls the voltage low with pulses of different lengths.
- 200 mS pulse from receiver assembly requests illuminated entry on.
- 300 mS pulse from receiver assembly requests illuminated entry off.
Two quick presses on the keyless entry keypad may cause the GEM illuminated entry to shut off. Pressing the keypad button at different rates may cause the interior lights to flicker. This condition can be corrected by replacing the GEM. After February 1995, call the phone number on the GEM or receiver assembly for additional information.

C1 CHECK ILLUMINATED ENTRY OPERATION
- Press the UNLOCK button on a remote transmitter for any keypad button) to unlock the doors and turn the illuminated entry on.
- Press the LOCK button on a remote transmitter (or lock with keypad) within 20 seconds of pressing the UNLOCK button to lock the doors and turn the illuminated entry off.
Does illuminated entry work as described?
Yes
Illuminated entry request function appears OK. CLARIFY with customer and REVIEW customer symptoms table.
No
If illuminated entry did not work as described, GO to C2 . If driver's door either did not lock or did not unlock, REPEAT C1 to make sure transmitter was pressed and GO to Pinpoint Test B.

C2 MEASURE GEM ILLUMINATED ENTRY VOLTAGES
- Measure the voltage on Circuit 1013 (BR/LG) at the receiver assembly (keep modules connected) using signal ground Circuit 570 (BK/W) as a voltage reference. Measure voltage with NGS, DIGITAL MEASUREMENT, VOLTMETER, setting RANGE at 40V.
- Continue to measure voltage and press the UNLOCK button on the transmitter (or any keypad button).
Was the MIN voltage captured when the pulse was transmitted less than 1.3V?
Yes
GO to C3 .
No
CLEAR MIN voltage and REPEAT Test C2 once to CONFIRM high voltage; if so, CALL phone number on receiver assembly for additional assistance.


C3 MEASURE GEM ILLUMINATED ENTRY PULSE WIDTH.
- Keep setup from C2.
- Select NGS, DIGITAL MEASUREMENT, PULSE WIDTH METER, and choose LEVEL setting LOW.
- Press the UNLOCK button on the transmitter (or any keypad button).
Was the PULSE WIDTH between 190 and 210 mS?
Yes
GO to C4
No
CALL phone number on receiver assembly for additional assistance.



C4 CHECK GEM ILLUMINATED ENTRY REQUEST CIRCUIT
- Check Circuit 1013 (BR/LG) for shorts or an open between the RAP and GEM modules.
Is the wiring OK?
Yes
GO to GEM Module General Moduleto diagnose the GEM module for illuminated entry operation.
No
SERVICE Circuit 1013 (BR/LG).