Test Procedures
- Using ohmmeter, check continuity between pin No. 2 of Brown connector and ground. If continuity exists, go to next step. If not, repair Black wire in Brown connector. Refer to KEYLESS ENTRY MODULE CONNECTOR TERMINAL IDENTIFICATION in the figure. See Fig 1 .
- Turn ignition off. Disconnect Brown connector. With driver's seat unoccupied, check continuity between pins No. 2 and 9 of connector. If no continuity exists, go to step 4). If continuity exists, go to next step.
- Disconnect driver's seat switch. Check for short between pin No. 9 of Brown connector and ground. If short is found, repair White wire and repeat QUICK TEST . If no short is found, replace seat switch and repeat QUICK TEST .
- Have an assistant sit in driver's seat. Check continuity between pins No. 2 and 9 in Brown connector. If continuity exists, go to step 6). If not, go to next step.
- With driver's seat occupied, check continuity between pin No. 9 of Brown connector and driver's seat switch connector White wire. If continuity exists, replace seat switch and repeat QUICK TEST . If no continuity exists, repair White wire and repeat QUICK TEST .
- Using voltmeter, check voltage between pins No. 2 and 13 of Brown connector. If reading is 10 volts or more, go to next step. If reading is less than 10 volts, check for open or shorts in circuits No. 54B and 54C. See KEYLESS ENTRY SYSTEM WIRING DIAGRAM. Repeat QUICK TEST .
- Check that dome/courtesy lights come on when each courtesy light switch is operated. If lights come on, go to next step. If not, repair switch or wiring and repeat QUICK TEST .
- Disconnect Green connector. With all doors closed, check voltage between pin No. 12 of Green connector and ground. If reading is zero volts, go to next step. If reading is more than zero volts, replace door switch or repair Black/Light Blue wire. Wire is shorted to battery voltage. Repeat QUICK TEST .
- Close all doors. Open any door and check voltage at pin No. 12 of Green connector. Repeat procedure for every other door. If all readings are 10 volts or more, go to next step. If not, replace door switch(es) or repair Black/Light Blue wire. Repeat QUICK TEST .
- Turn ignition off. Check voltage between pin No. 8 of Brown connector and ground. If reading is zero volts, go to next step. If reading is more than zero volts, repair or replace ignition switch. Repeat QUICK TEST .
- Turn ignition on. Check voltage between pin No. 8 of Brown connector and ground. If reading is 10 volts or more, go to step 13). If reading is less than 10 volts, go to next step.
- Turn ignition off. Check for short between pin No. 8 of Brown connector and ground. Also check for continuity between pin No. 8 and ignition switch circuit No. 194B (Town Car) or 298 (all other models). If wiring is okay, go to next step. If not, replace ignition switch or repair circuit No. 194B or 298. Repeat QUICK TEST .
- Turn ignition on. With transmission in "R" position, check voltage between pin No. 10 of Brown connector and ground. Shift transmission into all other positions. If reading is 10 volts in "R" and zero volts in any other position, replace keyless entry module. If reading is less than 10 volts in "R" or more than zero volts in all other positions, go to next step.
- Test operation of back-up light switch by placing transmission in "R" position. Make sure back-up lights come on. If switch is okay, check for open or short in Black/Pink wire. If switch is defective, replace switch and repeat QUICK TEST .
- Using an ohmmeter, check resistance between pin No. 14 of Brown connector and ground. Lift outside door handle to open door latch, observe ohmmeter, and then close latch with a screwdriver. If reading is greater than 10,000 ohms with latch closed and less than 10 ohms with latch open, replace keyless entry module and repeat QUICK TEST .
- If reading is less than 10,000 ohms with latch closed, check and/or service door ajar switch circuit. If reading is greater than 10 ohms with latch open, repeat QUICK TEST .