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Pinpoint Test A - Alarm Will Not Arm

NOTE: In all of the following tests, ignition key should always be in OFF position unless otherwise specified in a specific test.
  1. With ignition key off, check 15-amp. ROOM fuse in passenger compartment fuse panel. If fuse is blown, go to next step. If fuse is okay, go to step 3).
  2. Replace fuse. If fuse blows again, repair short-to-ground in anti-theft fuse circuit. If fuse does not fail, go to next step.
  3. Disconnect 20-pin connector from CPU. See CONNECTOR IDENTIFICATION. Open hood. Measure resistance of Brown/White wire between CPU connector and ground. Close hood. Measure resistance again. Resistance should be less than 5 ohms with hood closed and more than 10,000 ohms with hood open. If resistance is correct, go to step 6). If resistance is not correct, go to next step.
  4. Disconnect hood switch connector. Open hood. Measure resistance between terminals of switch. Close hood and repeat measurement. If resistance is less than 5 ohms with hood closed, and more than 10,000 ohms with hood open, go to next step. If resistances are not correct, replace hood switch.
  5. Disconnect hood switch connector. Measure resistance of Black wire between switch connector and ground. If resistance is less than 5 ohms, repair Brown/White wire. If resistance is more than 5 ohms, repair Black wire.
  6. Disconnect 20-pin connector from CPU. Place key in driver's door lock in unlock position. Measure resistance of Yellow/Red wire between CPU connector and ground. Place door key in rest position. Measure resistance of Yellow/Red wire between CPU connector and ground. Repeat procedure for passenger door lock. If resistance is less than 5 ohms with key in unlock position and more than 10,000 ohms with key at rest, go to step 8). If resistance is not as indicated, go to next step.
  7. Disconnect key cylinder switch connector in question. Measure resistance between Yellow/Red wire terminal and Black wire terminal of switch with key in unlock and rest positions. If resistance is less than 5 ohms with key in unlock position, and more than 10,000 ohms with key in rest position, check Yellow/Red wire for short. If resistances are not correct, replace key cylinder switch.
  8. Disconnect 20-pin connector from CPU and trunk light switch connector. Measure resistance of Light Blue wire between CPU connector and light switch connector, and between light switch connector and ground. If resistance is less than 5 ohms between switch connector and CPU connector, and more than 10,000 ohms between switch connector and ground, go to next step. If resistances are not correct, repair Light Blue wire.
  9. Disconnect 20-pin CPU connector. Place key in liftgate lock cylinder in unlock position. Measure resistance of Light Green/Red wire between CPU connector and ground. Remove key. Measure resistance again. If resistance is less than 5 ohms with key in unlock position and more than 10,000 ohms with key removed, go to step 12). If resistances are not correct, go to next step.
  10. Disconnect liftgate key cylinder switch connector. Place key in lock cylinder in unlock position. Measure resistance between Light Green/Red wire terminal and Black wire terminal of switch. Remove key and measure resistance again. If resistance is less than 5 ohms with key in unlock position, and more than 10,000 ohms with key removed, go to next step. If resistances are not correct, replace key cylinder.
  11. Disconnect liftgate key cylinder switch connector. Measure resistance of Black wire between key switch connector and ground. If resistance is less than 5 ohms, repair Light Green/Red wire. If resistance is more than 5 ohms, repair Black wire.
  12. Disconnect 20-pin CPU connector. Unlock doors manually. Measure resistance of Yellow wire between CPU connector and ground. Measure resistance of Brown/Yellow wire between CPU connector and ground. Lock doors manually. Measure resistance of Yellow wire between CPU connector and ground. Measure resistance of Brown/Yellow wire between CPU connector and ground. If resistance is less than 5 ohms with doors unlocked, and more than 10,000 ohms with doors locked, go to step 15). If resistance is not correct, go to next step.
  13. Disconnect both door power door lock motor switch connectors. Measure resistance between Yellow wire terminal and Black wire terminal of motor switch connector with doors locked and unlocked. Measure resistance between Brown/Yellow wire terminal and Black wire terminal of motor switch connector with doors locked and unlocked. If resistance is less than 5 ohms with doors unlocked, and more than 10,000 ohms with doors locked, go to next step. If resistances are not correct, replace motor switch(es) in question.
  14. With key off, remove 15-amp ROOM fuse from fuse panel. Disconnect both power door lock motor switch connectors. Measure resistance of Black wires between each motor switch connector and ground. If resistance is less than 5 ohms, repair Yellow wire for right door motor, or Black/Yellow wire for left door motor. If resistance is more than 5 ohms, repair Black wire(s) in question.
  15. Disconnect 16-pin CPU connector from top of interior fuse panel located at left side kick panel. Using a voltmeter, measure voltage at pin 3 of connector. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, replace interior fuse panel.
  16. Disconnect CPU from fuse panel. Measure resistance between pin 4 of 16-pin fuse panel connector and ground. If resistance is less than 5 ohms, replace CPU. If resistance is more than 5 ohms, go to next step.
  17. Disconnect 16-pin fuse panel connector. Measure resistance of Black wire between connector and ground. If resistance is less than 5 ohms, replace fuse panel. If resistance is more than 5 ohms, repair Black wire.
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