Pinpoint Test Q: The LH/RH Turn Signal Indicator Is Never/Always On

Normal Operation 

When the multifunction switch is in the LH or RH TURN position, a message is sent to the instrument cluster (IC) from the smart junction box (SJB) over the medium speed controller area network (MS-CAN) communication bus. The instrument cluster (IC) upon receipt of the LH or RH turn message, flashes the LH or RH turn signal indicator on and off.

This pinpoint test is intended to diagnose the following:

• SJB
• Instrument cluster (IC)

PINPOINT TEST Q: THE LH/RH TURN SIGNAL INDICATOR IS NEVER/ALWAYS ON 

1. Q1 CHECK THE LH OR RH TURN SIGNAL LAMPS OPERATION 
   • Key in ON position.
   • Operate the LH or RH turn signal. Observe the exterior LH or RH turn lamps.
   • Do the turn signal lamps operate correctly? 
   1. YES  : Go to  Q2.
   2. NO  : REFER to EXTERIOR LIGHTING article.
2. Q2 CARRY OUT THE INSTRUMENT CLUSTER (IC) INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL 
   • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster (IC) DataLogger
   • Select the instrument cluster (IC) LH or RH turn signal indicator (L_TURN) or (R_TURN) active command and command the LH or RH turn signal indicator on and off. Observe the LH or RH turn signal indicator.
   • Does the LH or RH turn signal indicator illuminate when commanded on, and turn off when commanded off? 
   1. YES  : Go to  Q3.
   2. NO  : Go to  Q5.
3. Q3 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND INSTRUMENT CLUSTER (IC) SELF-TESTS 
   • Check for recorded instrument cluster (IC) DTCs from the continuous and on-demand self-tests.
   • Is DTC U0140 recorded? 
   1. YES  : Go to Pinpoint Test AI  .
   2. NO  : Go to  Q4.
4. Q4 CHECK FOR CORRECT SJB OPERATION 
   • Disconnect all the SJB connectors.
   • Check for:
     • corrosion
     • damaged pins
     • pushed-out pins
   • Connect all the SJB 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 SJB. 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. Q5 CHECK FOR CORRECT INSTRUMENT CLUSTER (IC) OPERATION 
   • Disconnect the instrument cluster (IC) connector.
   • Check for:
     • corrosion
     • damaged pins
     • pushed-out pins
   • Connect the instrument cluster (IC) connector and make sure it seats correctly.
   • Operate the system and verify the concern is still present.
   • Is the concern still present? 
   1. YES  : INSTALL a new instrument cluster (IC). REFER to Instrument Cluster (IC) . 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.