Normal Operation

The Instrument Panel Cluster (IPC) receives the key-in-ignition warning status from the Smart Junction Box (SJB) over the Medium Speed Controller Area Network (MS-CAN) communication bus.

On vehicles without Intelligent Access (IA), the key-in-ignition warning switch (part of the ignition switch) is hardwired to the SJB through the key-in-ignition input circuit. When the key is inserted into the ignition lock cylinder, the key-in-ignition switch closes and supplies voltage to the SJB.

On vehicles with IA, the SJB receives the key-in-ignition status from the Remote Function Actuator (RFA) module through the key-in-ignition input circuit. When the ignition is placed in the ACC position or if the vehicle is turned off with the selector lever out of PARK (P), the RFA module provides voltage to the SJB through the key-in-ignition input circuit.

The SJB monitors the door ajar input from the LH front door and the key-in-ignition switch status. When the SJB detects a key-in-ignition voltage and the LH front door is open or ajar, the SJB sends the IPC a chime request message to sound the key-in-ignition warning chime.

• DTC B1217:15 (Passive Key-In-Ignition Output: Circuit Short to Battery or Open) - an on-demand DTC that sets in the RFA module when the RFA module detects an open or short to voltage on the key-in-ignition output circuit.
• DTC B1352 (Ignition Key-In Circuit Failure) - an on-demand DTC that sets in the SJB if the SJB detects an open on the key-in-ignition switch input circuit or if the SJB detects ignition START, RUN/START or RUN/ACC inputs without the key-in-ignition input.

This pinpoint test is intended to diagnose the following: 

• Wiring, terminals or connectors
• Key-in-ignition switch (part of the ignition switch) (without IA)
• RFA module (with IA)
• SJB
• IPC