Pinpoint Test U: The LH/RH Turn Or High Beam Indicator Is Never/Always On
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test U: The LH/RH Turn Or High Beam Indicator Is Never/Always On
Normal Operation
When the multifunction switch is in the LH or RH TURN position or if the high beams are on, 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 IC, upon receipt of the LH/RH turn or high beam on message, flashes the LH or RH turn signal indicator on and off or illuminates the high beam indicator.
This pinpoint test is intended to diagnose the following:
- Turn signal concern
- High beam concern
- SJB
- IC
PINPOINT TEST U: THE LH/RH TURN OR HIGH BEAM INDICATOR IS NEVER/ALWAYS ON
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U1 DETERMINE THE FAULT CONDITION
- Place the headlamps in the HIGH BEAM position.
- Ignition ON.
- Observe the high beam indicator.
- Does the high beam indicator illuminate?
Yes
GO to U4.
No
LEAVE the headlamps in the HIGH BEAM position. GO to U2.
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U2 CHECK THE HIGH BEAM HEADLAMPS OPERATION
- Observe the high beam headlamps.
- Do the high beam headlamps operate correctly?
Yes
GO to U3.
No
REFER to Headlamp. Testing and Inspection
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U3 CARRY OUT THE IC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL
- Turn off the headlamps.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC high beam indicator (HIGH_BEAM) active command. Command the high beam indicator on and off. Observe the high beam indicator.
- Does the high beam indicator illuminate when commanded on, and turn off when commanded off?
Yes
GO to U6.
No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.
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U4 CHECK THE LH OR RH TURN SIGNAL LAMPS OPERATION
- Operate the LH or RH turn signal. Observe the exterior LH or RH turn lamps.
- Do the turn signal lamps operate correctly?
Yes
GO to U5.
No
REFER to Turn Signals. Testing and Inspection
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U5 CARRY OUT THE IC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC RH or LH turn signal indicator (RHTURN) or (LHTURN) active command. Command the RH or LH 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?
Yes
GO to U6.
No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.
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U6 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND IC SELF-TESTS
- Check for recorded IC DTCs from the continuous and on-demand self-tests.
- Are any DTCs recorded?
Yes
For DTC U0140, Go To Pinpoint Test AH. Pinpoint Tests AH: DTC U0140
For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes
No
INSTALL a new SJB. TEST the system for normal operation.
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