Diagnostic Aids
This system provides an audible and visual warning of illegal entry to the vehicle. The entry deterrent system arms when:
| • | The lock button on the remote coded key is pressed. |
| • | All doors lock successfully. |
| • | Ten seconds has elapsed. |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Theft Deterrent System Schematics | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 | Is the Central Door Locking system fully functional? | -- | Go to Step 3 | Go to Symptoms - Doors in Doors |
3 | Are all door ajar switches and associated circuits functioning correctly? | -- | Go to Step 4 | Go to Diagnostic Starting Point - Lighting Systems in Lighting Systems |
4 | Is the Theft Deterrent system fully functional? | -- | Go to Step 5 | |
5 | Do all indicators operate correctly? | -- | Go to Step 6 | Go to Diagnostic Starting Point - Lighting Systems in Lighting Systems |
6 | Is the dome lamp fully functional using the manual switch? | -- | Go to Step 7 | Go to Diagnostic Starting Point - Lighting Systems in Lighting Systems |
7 | The alarm may sound in this step.
Is the alarm triggered? | -- | Go to Step 8 | Go to Step 15 |
8 | In Step 7, did both the theft deterrent and standard vehicle horns sound? | -- | Go to Step 9 | Go to Step 17 |
9 | In Step 7, did both indicators and the dome lamp flash once every second? | -- | Go to Step 10 | Go to Step 37 |
10 | Disarm the system by pressing the remote coded key Unlock button. Do the indicators flash 3 times and does the multifunction display show the alarm trigger point? | -- | Go to Step 11 | Go to Step 37 |
11 | The alarm may sound in this step.
Does the passenger door trigger the alarm? | -- | Go to Step 12 | Go to Step 24 |
12 | The alarm may sound in this step.
Does opening the rear compartment trigger the alarm? | -- | Go to Step 13 | Go to Step 27 |
13 | The alarm may sound in this step.
Is the alarm triggered? | -- | Go to Step 14 | Go to Step 26 |
14 |
Is the alarm triggered? | -- | Go to Step 15 | Go to Step 35 |
15 |
Does the screen display the correct driver door status? | -- | Go to Step 37 | Go to Step 16 |
16 |
Are the values as specified? | Door open = 0 volts Door closed = 3 volts | Go to Step 37 | Go to Step 38 |
17 | The alarm may sound in this Step.
Is the alarm triggered? | -- | Go to Step 18 | Go to Step 19 |
18 |
Is the alarm triggered? | -- | Go to Step 37 | Go to Step 22 |
19 |
Is the value as specified? | ON = Battery voltage OFF = Approx. 1 volt | Go to Step 20 | Go to Step 37 |
20 |
Is the value as specified? | ON = Battery voltage OFF = Approx. 1 volt | Go to Step 21 | Go to Step 39 |
21 | Back-probe between the theft deterrent horn base and a known good ground with an ohmmeter. Refer to Testing for Continuity . Is the measurement less than the value specified? | 1 ohms | Go to Step 40 | Go to Step 41 |
22 | Press the horn pad on the steering wheel. Is the horn triggered? | -- | Go to Step 23 | Refer to Diagnostic Starting Point - Horns in Horns. |
23 | Back-probe the ground circuit of the horn relay coil at the BCM connector with a jumper lead to ground. Refer to Using Fused Jumper Wires in Wiring Systems. Is the alarm triggered? | -- | Go to Step 37 | Go to Step 50 |
24 | In Step 6, did the passenger door trigger the alarm? | -- | Go to Step 42 | Go to Step 25 |
25 |
Does the scan tool display the door status? | -- | Go to Step 37 | Go to Step 26 |
26 |
Is the measurement less than the value specified? | 0.5 V | Go to Step 37 | Go to Step 42 |
27 |
Does the scan tool display the rear compartment status (open then close)? | -- | Go to Step 37 | Go to Step 28 |
28 |
Is the measurement less than the value specified? | 0.5 V | Go to Step 37 | Go to Step 29 |
29 |
Is the measurement less than the value specified? | 1 ohms | Go to Step 43 | Go to Step 30 |
30 | With the rear compartment switch connector disconnected, probe between the switch base and a known good ground with an ohmmeter. Refer to Testing for Continuity in Wiring Systems. Is the value less than the value specified? | 1 ohms | Go to Step 44 | Go to Step 45 |
31 |
Does the scan tool display the hood status (open then closed)? | -- | Go to Step 37 | Go to Step 32 |
32 |
Is the measurement less than the value specified? | 1 ohms | Go to Step 34 | Go to Step 33 |
33 | With the theft deterrent hood switch connectors disconnected, probe between the hood switch base and the battery negative post with an ohmmeter. Is the measurement less than the value specified? | 1 ohms | Go to Step 46 | Go to Step 47 |
34 | With the theft deterrent hood switch connectors disconnected, inspect the integrity of the hood switch circuits. Are the circuits OK? | -- | Go to Step 37 | Go to Step 48 |
35 |
Is the value as specified? | ON | Go to Step 37 | Go to Step 36 |
36 |
Is the measurement equal to the value specified? | B+ | Go to Step 37 | Go to Step 49 |
37 | Replace the BCM. Refer to Body Control Module Replacement . Did you complete the repair? | -- | Go to Step 51 | -- |
38 | Repair the drivers door ajar switch input circuit to the BCM. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 51 | -- |
39 | Repair the theft horn feed circuit between the BCM and the theft horn. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 51 | -- |
40 | Replace the theft deterrent horn. Refer to Horn Replacement in Horns. Did you complete the repair? | -- | Go to Step 51 | -- |
41 | Inspect and repair the ground connection of the theft deterrent horn. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Did you complete the repair? | -- | Go to Step 51 | -- |
42 | Repair the passenger door ajar switch input circuit to the BCM. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 51 | -- |
43 | Repair the rear compartment lamp switch input circuit to the BCM. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 51 | -- |
44 | Replace the rear compartment lamp switch. Did you complete the repair? | -- | Go to Step 51 | -- |
45 | Inspect and repair the ground connection of the rear compartment lamp switch. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Did you complete the repair? | -- | Go to Step 51 | -- |
46 | Replace the hood switch. Did you complete the repair? | -- | Go to Step 51 | -- |
47 | Inspect and repair the ground connection of the hood switch. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Did you complete the repair? | -- | Go to Step 51 | -- |
48 | Repair the hood switch input circuits to the BCM. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 51 | -- |
49 | Repair the ignition battery positive feed to the BCM. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 51 | -- |
50 | Repair the ground circuit of the horn relay coil. refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 51 | -- |
51 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 1 |
