Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: Door Lock/Indicator Schematics DEFINITION: This diagnostic table should be used to diagnose a complete failure of all the unlock functions. | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 | Actuate each door lock switch, one at a time, to the unlock position. Did the doors unlock from each switch? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Did the doors unlock from any switch? | Go to Step 4 | |
4 |
Did the doors unlock? | Go to Step 5 | Go to Step 6 |
5 |
Does the Passenger Door Unlock parameter change state? | Go to Step 20 | Go to Step 13 |
6 |
Does the test lamp illuminate? | Go to Step 7 | Go to Step 18 |
7 | Connect a test lamp between the battery positive voltage circuit on the switched side of the door unlock relay at the fuse block and a good ground. Does the test lamp illuminate? | Go to Step 8 | Go to Step 18 |
8 |
Did the test lamp illuminate? | Go to Step 9 | Go to Step 14 |
9 |
Does the test lamp illuminate? | Go to Step 10 | Go to Step 19 |
10 |
Did the doors unlock? | Go to Step 12 | Go to Step 11 |
11 | Inspect for poor connections at the door unlock relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 16 |
12 | Inspect for poor connections at the door lock relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 17 |
13 | Test for an open in the door unlock control circuit between the body control module (BCM) and the door lock switches. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 15 |
14 | Test for an open in the door lock control circuit between the BCM and the door unlock relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 15 |
15 | Inspect for poor connections at the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 20 |
16 | Replace the door lock relay. Did you complete the repair? | Go to Step 21 | -- |
17 | Replace the door unlock relay. Did you complete the repair? | Go to Step 21 | -- |
18 | Repair the open in the door lock relay battery positive voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 21 | -- |
19 | Repair the open in the door lock relay ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 21 | -- |
20 | Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the repair? | Go to Step 21 | -- |
21 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |