Trouble Shooting: Notes

Trouble shooting of an anti-theft system complaint begins with verification of the customer problem. If problem occurs, go to step 3. If problem does not occur, go to next step.
If problem does not occur, review conditions under which problem occurred for customer and try to duplicate those conditions. For example, if the problem occurs on rainy days or during high humidity conditions, sprinkle water onto vehicle and see if malfunction occurs. DO NOT sprinkle water directly into engine compartment or onto electronic components. Visually inspect for signs of mechanical and electrical damage. Inspect for blown fuses and damaged relays. Inspect for loose or corroded connections, damaged wiring harnesses and/or switches. Check for a broken or partially broken wire inside insulation, which could cause system malfunction but prove good in a continuity/voltage check with system disconnected. Ensure any aftermarket electronic equipment is properly installed. If fault is found, repair as necessary.
Before trouble shooting the anti-theft system, first make certain that the door lock control system is operating normally. See appropriate POWER DOOR LOCKS & LIFTGATE article in DOOR LOCKS & ANTI-THEFT SYSTEMS.

Determine problem symptom. See PROBLEM SYMPTOM INDEX table.

PROBLEM SYMPTOM INDEX

Symptom

Suspected Area ⁽¹⁾

Anti-Theft System Cannot Be Set

⁽²⁾⁽³⁾⁽⁴⁾⁽⁵⁾⁽⁶⁾⁽⁷⁾⁽⁸⁾

Indicator Light Does Not Blink When System Is Set

⁽²⁾

When Rear Door Is Unlocked, The System Is Set Or Does Not Operate

⁽⁷⁾

When Engine Hood Is Opened, The System Is Set Or Does Not Operate

⁽⁸⁾

While System Is In Warning Operation, Horns Do Not Sound

⁽⁹⁾

While System Is In Warning Operation, Theft Deterrent Horn Does Not Sound

⁽¹⁰⁾

While System Is In Warning Operation, Headlights Do Not Flash

⁽¹¹⁾

While System Is In Warning Operation, Taillights Do Not Flash

⁽¹²⁾

While System Is In Warning Operation, Door Lock Is Not Locked

⁽⁷⁾

When System Is Set, It Is Not Canceled When The Ignition Key Is Turned To ACC Or ON Position

⁽¹³⁾

System Is Still Set Even When A Rear Door Is Opened

⁽⁶⁾

Even When The System Is Not Set, Horns Sound

⁽⁹⁾

Even When The System Is Not Set, Theft Deterrent Horn Sounds

⁽¹⁰⁾

Even When The System Is Not Set, Headlights Stay On

⁽¹¹⁾

Even When The System Is Not Set, Taillights Stay On

⁽¹²⁾

⁽¹⁾	Perform test procedures in order listed under suspected area.

⁽²⁾	Check the indicator light circuit. See INDICATOR LIGHT CIRCUIT under CIRCUIT TESTS.

⁽³⁾	Check the ECU power source circuit. See ECU POWER SOURCE CIRCUIT under CIRCUIT TESTS.

⁽⁴⁾	Check the key unlock warning switch circuit. See KEY UNLOCK WARNING SWITCH CIRCUIT under CIRCUIT TESTS.

⁽⁵⁾	Check the door key lock and unlock switch circuit. See DOOR KEY LOCK & UNLOCK SWITCH CIRCUIT under CIRCUIT TESTS.

⁽⁶⁾	Check the door courtesy switch circuit. See DOOR COURTESY SWITCH CIRCUIT under CIRCUIT TESTS.

⁽⁷⁾	Check the door unlock detection switch circuit. See DOOR UNLOCK DETECTION SWITCH CIRCUIT under CIRCUIT TESTS.

⁽⁸⁾	Check the engine hood courtesy switch circuit. See ENGINE HOOD COURTESY SWITCH CIRCUIT under CIRCUIT TESTS.

⁽⁹⁾	Check the horn relay circuit. See HORN RELAY CIRCUIT under CIRCUIT TESTS.

⁽¹⁰⁾	Check the theft deterrent horn circuit. See THEFT DETERRENT HORN CIRCUIT under CIRCUIT TESTS.

⁽¹¹⁾	Check the headlight control relay circuit. See HEADLIGHT CONTROL RELAY CIRCUIT under CIRCUIT TESTS.

⁽¹²⁾	Check the taillight control relay circuit. See TAILLIGHT CONTROL RELAY CIRCUIT under CIRCUIT TESTS.

⁽¹³⁾	Check the ignition switch circuit. See IGNITION SWITCH CIRCUIT under CIRCUIT TESTS.

After repairs have been completed, confirm that problem has been eliminated. Operate the system under same conditions recorded for original complaint. If problem is no longer present, repair has corrected problem. If problem is still present, further diagnosis and repair is required.