Normal Operation

The Smart Junction Box (SJB) monitors for a ground signal on the keyless entry keypad signal input circuits. When an individual keypad button is touched, an individual or combination of the input circuits is routed to ground. The SJB  then determines which button was touched based on which circuit(s) are grounded. The keypad has dedicated voltage supply and ground circuits. Once the SJB  determines that the 5-digit personal entry code, or the factory set 5-digit entry code has been entered on the keypad, the SJB  then unlocks the driver door.

To unlock all the doors, the 3/4 button must be pressed within 5 seconds of the 5-digit code being entered.

To release the liftgate window, the 5/6 button must be pressed within 5 seconds of the 5-digit code being entered.

To lock all the doors, the 5-digit code does not need to be entered. Press the 7/8 and 9/0 buttons at the same time.

• DTC B2A26 (Keypad Switch Circuit Failure) - a continuous and on-demand DTC that sets when the SJB  detects a short to ground on any of the keypad input circuits. This DTC may also set if any of the keypad buttons are pressed for longer than 2 minutes.

This pinpoint test is intended to diagnose the following: 

• Wiring, terminals or connectors
• Keyless entry keypad
• SJB