Pinpoint Test W: The LH/RH Or High Beam Turn Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test W: The LH/RH Or High Beam Turn 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. Upon receipt of the LH or RH turn message, the IC flashes the LH or RH turn signal indicator on and off.

When the high beams are turned on, the SJB sends a signal to the IC through the MS-CAN communication bus to illuminate the high beam indicator. If the high beam status message is missing for more than 5 seconds, the IC sets DTC U0140 in continuous memory and defaults the high beam indicator off.

This pinpoint test is intended to diagnose the following:

- Turn signal concern
- High beam concern
- SJB
- IC



PINPOINT TEST W: THE LH/RH OR HIGH BEAM TURN INDICATOR IS NEVER/ALWAYS ON

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W1 DETERMINE THE FAULT CONDITION


- Place the headlamp switch in the HIGH BEAM position.
- Ignition ON.
- Observe the high beam indicator.
- Does the high beam indicator illuminate?

Yes
GO to W4.

No
LEAVE the headlamp switch in the HIGH BEAM position. GO to W2.

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W2 CHECK THE HIGH BEAM HEADLAMPS OPERATION


- Observe the high beam headlamps.
- Do the high beam headlamps operate correctly?

Yes
GO to W3.

No
REFER to Lighting and Horns.

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W3 CARRY OUT THE IC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger .
- Select the IC high beam indicator (HIGH_BEAM).
- 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 W6.

No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.

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W4 CHECK THE LH OR RH TURN SIGNAL LAMPS OPERATION


- Ignition ON.
- 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 W5.

No
REFER to Lighting and Horns.

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W5 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 (R_TURN) or (L_TURN) 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 W6.

No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.

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W6 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


- Check for recorded IC DTCs from the self-test.
- Is DTC U0140 recorded?

Yes
GO to Pinpoint Test BH. Pinpoint Tests BH: DTC U0140

No
INSTALL a new SJB. REFER to Body Control Systems. TEST the system for normal operation.

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