Pinpoint Test M: The Smart Unlock Does Not Operate Correctly

Normal Operation 

The lighting control module (LCM) sends a network message to the driver door module (DDM) that the key is in the ignition. If the DDM does not receive or receives invalid data for the key-in ignition from the LCM, it will set DTC U1135. The DDM monitors the network message, the door lock control switch and the LH front door ajar switch. If the key is in the ignition and the LH front door is open when the vehicle is locked with a door lock control switch, the DDM unlocks the LH front door. The smart unlocking feature unlocks the LH front door 1 second after these conditions are met. The vehicle may still be locked with the key in the ignition using the manual lock button, a remote keyless entry (RKE) transmitter, the keyless entry keypad or a key in the driver door lock cylinder.

This pinpoint test is intended to diagnose the following:

• Driver door ajar switch
• Key-in-ignition switch
• LCM
• DDM

PINPOINT TEST M: THE SMART UNLOCK DOES NOT OPERATE CORRECTLY 

1. M1 CHECK THE COURTESY LAMP OPERATION 
   • Open and close the doors while observing the courtesy lamp operation.
   • Do the courtesy lamps operate correctly? 
   1. YES  : Go to  M2.
   2. NO  : REFER to INTERIOR LIGHTING article.
2. M2 CHECK THE KEY-IN-IGNITION SWITCH OPERATION 
   • Insert the key in the ignition.
   • Key in OFF position.
   • Open the driver door.
   • Does the chime sound? 
   1. YES  : Go to  M3.
   2. NO  : REFER to INSTRUMENTATION, MESSAGE CENTER, & WARNING CHIMES article to continue diagnosis of the key-in-ignition warning system.
3. M3 RETRIEVE THE RECORDED DDM DTCs FROM THE SELF-TEST 
   • Check the recorded results from the DDM self-test.
   • Is continuous DTC U1135 retrieved? 
   1. YES  : Go to  M4.
   2. NO  : Go to  M5.
4. M4 CHECK FOR CORRECT LCM OPERATION 
   • Disconnect all the LCM connectors.
   • Check for:
     • corrosion
     • damaged pins
     • pushed-out pins
   • Connect all the LCM connectors and make sure they seat correctly.
   • Operate the system and verify the concern is still present.
   • Is the concern still present? 
   1. YES  : INSTALL a new LCM. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
   2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
5. M5 CHECK FOR CORRECT DDM OPERATION 
   • Disconnect all the DDM connectors.
   • Check for:
     • corrosion
     • damaged pins
     • pushed-out pins
   • Connect all the DDM connectors and make sure they seat correctly.
   • Operate the system and verify the concern is still present.
   • Is the concern still present? 
   1. YES  : INSTALL a new DDM. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
   2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.