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DTC B2735: Pass-Key(R) II Programming Mode Active: Description

PASS-Key(R) II detection circuit is completed when PASS-Key(R) II (with embedded resistor pellet) is inserted in ignition lock cylinder. When contacts in lock cylinder mate with contacts of resistor pellet, key detection circuit through circuits No. 1073 (White/Black wire) and No. 1074 (Purple/White wire) is completed.

When ignition switch is turned from LOCK/OFF position to RUN position, BCM applies a 5-volt reference voltage to circuit No. 1073 (White/Black wire). BCM then reads resistor pellet code, and compares stored resistor pellet code with ignition key resistor pellet code to verify a correct match. If BCM determines that resistance value of key pellet is okay, BCM will use the class 2 serial data line to send an enable password to Powertrain Control Module (PCM). PCM will then energize theft deterrent relay and allow fuel delivery to engine.

When BCM is replaced, it must be programmed to accept resistance value of existing vehicle keys to allow PASS-Key(R) II operation. New BCM is programmed to accept first PASS-Key(R) II resistance value that it detects.

DTC B2735 will set when BCM is unable to detect a valid PASS-Key(R) II code during programming procedure, due to other malfunctions which are present (an open or short circuit). BCM will not end programming sequence. BCM will send a message to PCM to enable theft deterrent relay and to allow fuel delivery to engine. When DTC B2735 is set, BCM will send a message to instrument panel to turn on SECURITY warning indicator.

If conditions for malfunction no longer exist, history DTC will clear after 100 consecutive ignition cycles. DTC B2723 will also clear when conditions no longer exist or scan tool is used to clear codes.

NOTE: If DTC B2735 is a history code, it indicates that BCM had previously entered and successfully completed programming mode. Clear DTCs and recheck system operation.
NOTE: When ignition switch is turned to RUN position with BCM disconnected, PCM-related DTC P1626 will be set. After BCM repair is completed, see appropriate TESTS W/CODES article in ENGINE PERFORMANCE section:
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