Doors Do Not Lock Or Unlock With Keypad

Sit in vehicle. Operate door locks from interior switches. If doors lock and unlock properly, go to next step. If doors do not lock and unlock properly, go to ALL DOOR LOCKS INOPERATIVE.
From outside vehicle, operate all functions of remote transmitter. If system operates properly, go to next step. If system does not operate properly, repair any lock problem, then go to ALL DOOR LOCKS INOPERATIVE.
Connect and operate NGS tester following manufacturer's instructions. Select driver door module PID KEY_PAD. If numbers 1, 3, 5, 7, and/or 9 are present, repair short to B+ in suspect circuit and retest system. See WIRING DIAGRAMS . If no numbers are present, go to next step.
While viewing PID KEY_PAD, press all 5 keypad buttons one at a time. If all 5 buttons register a value, go to next step. If all buttons do not register a value, record values which did not register then go to step 7).
Ensure driver's window is open. Using door lock switch, lock vehicle. Enter factory unlock code. If driver's door unlocks, go to next step. If driver's door does not unlock, temporarily substitute known good DDM, then retest system.
Unlock all doors. Press 7/8 and 9/0 keypad switches concurrently. If all doors unlock, system if functioning properly. If all doors do not unlock, temporarily substitute known good DDM, then retest system.

Disconnect DDM connectors C518/C521 and C519/C520. See Figure and Figure . Measure voltage between ground and appropriate DDM connec tor terminal while pressing on indicated keypad button. See KEYPAD VOLTAGE TEST TABLE. If battery voltage is present, temporarily substitute known good DDM, then retest system. If battery voltage is not present, go to next step.

KEYPAD VOLTAGE TEST

Connector - Terminal (Wire Color) ⁽¹⁾

Keypad Button

C518/C521 - 11 (Light Blue/Yellow)

1/2

C518/C521 - 12 (Light Green/Red)

3/4

C519/C520 - 9 (Yellow/Black)

5/6

C518/C521 - 5 (Yellow)

7/8

C519/C520 - 1 (Red)

9/0

⁽¹⁾	See Figure and Figure .

Disconnect keypad connector C505. See Figure . Measure resistance between ground and suspect wire(s) in step 7). If resistance is less than 10 k/ohms, repair short to ground in suspect wire. If resistance is more than 10 k/ohms, go to next step.
Reconnect DDM connectors. Using NGS, request PID KEY_ PAD. Using fused jumper wire, connect keypad connector C505, terminal No. 5 (Light Green/Yellow wire on Crown Victoria and Grand Marquis or White/Purple wire on Town Car) to connector C505, terminals No. 2 (Light Blue/Yellow wire), No. 1 (Light Green/Red wire), No. 8 (Yellow/Black wire), No. 7 (Yellow wire) and No. 4 (Red wire) in sequence. See Figure . If all respective PIDs are displayed, temporarily substitute known good keypad, then retest system. If all respective PIDs are not displayed, repair open in appropriate wire.