Keypad Switch Circuit Failure
Table of contents
B2A26 MERCURY Possible Causes
- Faulty Keyless Entry Keypad
- Keyless Entry Keypad harness is open or shorted
- Keyless Entry Keypad circuit poor electrical connection
- Faulty Smart Junction Box (SJB)
How do I fix code B2A26 MERCURY?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the B2A26 MERCURY code
The cost of diagnosing the B2A26 MERCURY code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B2A26 MERCURY Description
The Smart Junction Box (SJB) monitors for a ground signal on the keyless entry keypad signal input circuits. When an inpidual keypad button is touched, an inpidual 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.
The Diagnostic Trouble Code (DTC) 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.