Circuit Description
The body control module (BCM) monitors the ignition key alarm switch. When the key is in the ignition, the ignition key alarm switch is closed and the signal circuit is low. When the key is not in the ignition, the ignition key alarm switch is open and the signal circuit is high.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2965 Key In Ignition Circuit Open
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
| • | The ignition 0 voltage circuit is active, and the key in ignition signal circuit is inactive or high. |
| • | These conditions must be present for more than 0.3 seconds. |
Action Taken When the DTC Sets
The BCM stores DTC B2965 in memory.
Conditions for Clearing the DTC
| • | The DTC becomes history when the fault is no longer present. |
| • | A history DTC is cleared after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. |
| • | The BCM receives the clear code command from the scan tool. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Body Control System Schematics | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the Key In Ignition parameter display Yes? | -- | Go to Step 3 | Go to Step 4 |
3 |
Does test lamp illuminate? | -- | Go to Step 7 | Go to Step 11 |
4 |
Does the test lamp illuminate? | -- | Go to Step 8 | Go to Step 5 |
5 | Test the signal circuit of the ignition key alarm switch for an open or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 6 |
6 | Test the ground circuit of the ignition key alarm switch for an open or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 9 |
7 | Test the ignition 0 voltage circuit for a short to battery voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 11 |
8 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 11 |
9 | Inspect for poor connections at the harness connector of the ignition switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 10 |
10 | Replace the ignition switch. Refer to Ignition and Start Switch Replacement . Did you complete the replacement? | -- | Go to Step 12 | -- |
11 | Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 12 | -- |
12 |
Does the DTC set? | -- | Go to Step 2 | System OK |
