Circuit Description
The ignition lock system consists of an ignition lock cylinder actuator and a park position switch. The actuator contains a pin that is spring loaded out, to prevent the ignition lock cylinder from being turned to the lock position when the gearshift is not in Park. The park position switch is located in the floor mounted gearshift assembly, as part of the automatic transmission shift lock control switch. The switch is closed with the gearshift in PARK, and open in all other positions
System Operation
When the gearshift is in the PARK position, the park position switch is closed. This applies ignition 0 voltage to the ignition lock cylinder actuator and the pin retracts, allowing the ignition lock cylinder to be turned to the LOCK position. When the gearshift is not in PARK, the park position switch is open. No voltage is applied to the ignition lock cylinder actuator and the spring loaded pin remains in the out position, preventing the ignition lock cylinder from being turned to LOCK.
Diagnostic Aids
| • | Ensure that the battery is fully charged. |
| • | Inspect the IGN 0 fuse and the IGN 0 relay for an open. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Column/Ignition Lock Schematics Connector End View Reference: Steering Wheel and Column Connector End Views | |||
1 | Verify the condition is present. Does the system operate normally? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 2 |
2 | Does the automatic transmission shift lever operate normally? | Go to Step 3 | Go to Diagnostic Starting Point - Automatic Transmission Shift Lock Control |
3 |
Were you able to remove the key? | Go to Step 4 | |
4 |
Does the test lamp turn ON and OFF with each cycle? | Go to Step 11 | Go to Step 5 |
5 | Does the test lamp remain illuminated with each cycle? | Go to Step 8 | Go to Step 6 |
6 | Connect a test lamp between the ground circuit of the ignition lock cylinder control actuator and B+ voltage. Does the test lamp illuminate? | Go to Step 7 | Go to Step 9 |
7 | Test the control circuit of the ignition lock cylinder control actuator for an open. Refer to Circuit Testing and to Wiring Repairs . Did you find and correct the condition? | Go to Step 14 | Go to Step 10 |
8 | Test the control circuit of the ignition lock cylinder control actuator for a short to voltage. Refer to Circuit Testing and to Wiring Repairs . Did you find and correct the condition? | Go to Step 14 | Go to Step 10 |
9 | Repair the open in the ground circuit of the ignition lock cylinder control actuator. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 14 | -- |
10 | Inspect for poor connections at the automatic transmission shift lock actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 14 | Go to Step 12 |
11 | Inspect for poor connections at the ignition lock cylinder control actuator. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs . Did you find and correct the condition? | Go to Step 14 | Go to Step 13 |
12 | Replace the automatic transmission shift lock actuator. Refer to Automatic Transmission Shift Lock Control Actuator Replacement . Did you complete the replacement? | Go to Step 14 | -- |
13 | Replace the ignition lock cylinder control actuator. Refer to Ignition and Start Switch Replacement . Did you complete the replacement? | Go to Step 14 | -- |
14 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
