LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 1996 >> Mustang Base, 2D Convertible, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Anti-Theft Systems >> Remote Keyless Entry System >> Testing >> Pinpoint Test B - Illuminated Entry Doesn't Work From Remote Transmitter
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Pinpoint Test B - Illuminated Entry Doesn't Work From Remote Transmitter

  1. Unplug connectors C400 and C402 from Remote Keyless Entry Module (RKEM). See Figure . Test for continuity to ground at harness connector terminals C402 pin No. 5 (Black/White wire), and harness connector terminals C400 pins No. 1 (Black wire) and 15 (Black wire). If all wires are okay, go to next step. Repair any defective wire.
  2. Unplug C401 connector from RKEM. Test for voltage at harness connector C401 pins No. 13, 14, and 25 (all Black/White wires). Test for battery voltage at harness connector C402 terminal No. 1 (Light Green/Yellow wire). If voltage is at least 9 volts, go to next step. If voltage is not at least 9 volts at any terminal, repair Black/White or Light Green/Yellow wire as necessary. See WIRING DIAGRAM  .
  3. Test for battery voltage at harness connector C401 terminals No. 10 and 23 (both Light Green/Yellow wires). If voltage is at least 9 volts, go to next step. If voltage is not at least 9 volts at either terminal, repair Light Green/Yellow wire as necessary.
  4. Reattach connector C401. Backprobe connector C401 terminals No. 10 and 23 (both Light Green/Yellow wires). If voltage is at least 10 volts, go to next step. If voltage is not at least 10 volts, repair shorted Light Green/Yellow wire.
  5. Backprobe connector C401 terminals No. 11 and 12 (both Light Green/Orange wires). If voltage is at least 10 volts, go to next step. If voltage is not at least 10 volts, temporarily substitute known-good RKEM, then retest system.
  6. Turn ignition on. Test for battery voltage at connector C402 pin No. 6 (White/Purple wire). Battery voltage should exist. Turn ignition off. Battery voltage should not exist. If voltage is as specified, go to next step. If voltage is not as specified, repair open circuit or short to voltage on White/Pink wire as necessary.
  7. Reattach connector C402. Measure voltage at connector C400 pin No. 17 (Gray wire) while rotating panel light dimmer control to ON position. If battery voltage exists, go to next step. If battery voltage does not exist, repair open Gray wire to courtesy light circuit.
  8. Rotate panel light dimmer control to OFF position. Test for continuity between connector C401 pin No. 10 (Light Green/Yellow wire) and mating terminal on RKEM. If continuity does not exist, go to next step. If continuity exists, temporarily substitute known-good headlight switch, then retest system.
  9. Rotate panel light dimmer control to ON position. Measure voltage at connector C400 pins No. 7 and 19 (both Black/Light Blue wires). If voltage is at least 10 volts, go to next step. If voltage is not at least 10 volts, temporarily substitute known-good RKEM, then retest system.
  10. Inspect for continuity between connector C402 pin No. 7 (White/Light Blue wire) and ground when each door handle is lifted, and when each handle is released. If continuity does not exist when either handle is lifted, go to next step. If continuity exists when both handles are released, go to step 12). If continuity exists when handle is lifted, and does not exist when handle is released, go to step 13).
  11. Rotate panel light dimmer control to OFF position. Unplug connector C400 from RKEM. Inspect for continuity between connector C400 pin No. 7 (Black/Light Blue wire) and mating pin on RKEM with each door open while the other is closed. If continuity exists with each door open while the other is closed, go to next step. If continuity is not as described, repair defective wiring or replace defective door switch.
  12. Connect jumper wire between connector C401 pin No. 10 (Light Green/Yellow wire) and connector C400 pin No. 7 (Black/Light Blue wire). Connect another jumper between connector C401 pin No. 23 (Light Green/Yellow wire) and connector C400 pin No. 19 (Black/Light Blue wire). If interior lights come on, go to next step. If lights do not come on, repair open or short circuit in Light Green/Yellow or Black/Light Blue wire. See WIRING DIAGRAM  .
  13. Inspect harness and RKEM connectors for loose, missing, or corroded pins. Repair as necessary. If all connections are okay, temporarily substitute known-good RKEM, then retest system.
scientia non olet · About LEMON Manuals