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Home >> Lincoln >> 2003 >> LS V6-3.0L DOHC VIN S >> Repair and Diagnosis >> Instrument Panel, Gauges and Warning Indicators >> Testing and Inspection >> Pinpoint Tests >> Pinpoint Tests - Instrument Panel Illumination >> Test C

Test C

PINPOINT TEST C: THE CONTROL ILLUMINATION IS ALWAYS ON


Test C1-C3:






Test C4-C5:






Test C6-C8:






Test C9-C11:






Test C12:






Normal Operation
The headlamp switch supplies the instrument cluster with the headlamp switch position status. The dimmer switch provides the instrument cluster with the dimmer control status through signal circuit 8-LE10 (WH/BK) and return circuit 9-LE10 (BN/YE). The instrument cluster sends the illumination message to the front electronic module (FEM) over the standard corporate protocol (SCP) communication network, circuits 4-EG8 (GY/VT) and 5-EG8 (BU/WH), based upon the dimmer switch position. The FEM is supplied with illumination power through circuit 29S-DK22 whenever the switched system power (SSP) is energized. When the headlamp switch is in the PARK, HEADLAMP, or AUTOLAMP ON position, the instrument cluster sends the FEM an illumination message and the FEM, in turn, provides a pulse width modulation (PWM) power to the interior auxiliary junction box through circuit 64S-LH5 (BU/YE). The interior auxiliary junction box separates the PWM power and supplies it to sub-illumination sources through circuits 64S-LH4 (BU/BK), 64S-LH1 (BU), 64S-LK9 (BU/WH), 64S-LH16 (BU/WH), 64S-LH1 (BU), and the central junction box (CJB) through circuit 64S-AD2 (BU/RD). The CJB separates the PWM power and also supplies it to the sub-illumination sources through circuits 64S-LH2 (BU/RD) and 64S-LH33 (BU/BK). The sub-illumination sources then provide the PWM power to the individual illuminating sources. If the dimmer switch signal and return circuits or the dimmer switch are open, the instrument cluster will default the FEM to maximum intensity.

Possible Causes
- circuit 64-LK18 (BU/RD) short to power
- circuit 64S-AD2 (BU/RD) short to power
- circuit 64S-AH27 (BU) short to power
- circuit 64S-AL19 (BU/BK) short to power
- circuit 64S-CG15 (BU/WH) short to power
- circuit 64S-GG25 (BU/OG) short to power
- circuit 64S-LE10 (BU/YE) short to power
- circuit 64S-LH1 (BU) short to power
- circuit 64S-LH2 (BU/RD) short to power
- circuit 64S-LH3 (BU/WH) short to power
- circuit 64S-LH4 (BU/BK) short to power
- circuit 64S-LH5 (BU/YE) short to power
- circuit 64S-LH14 (BU) short to power
- circuit 64S-LH15 (BU) short to power
- circuit 64S-LH16 (BU/WH) short to power
- circuit 64S-LH16A (BU/WH) short to power
- circuit 64S-LH26 (BU/BK) short to power
- circuit 64S-LH28 (BU) short to power
- circuit 64S-LH31 (BU/RD) short to power
- circuit 64S-LH32 (BU/RD) short to power
- circuit 64S-LH33A (BU/BK) short to power
- circuit 64S-LH33 (BU/BK) short to power
- circuit 64S-LH42 (BU/RD) short to power
- circuit 64S-LH45 (BU/OG) short to power
- circuit 64S-LH49 (BU/BK) short to power
- circuit 64S-LH50 (BU/YE) short to power
- circuit 64S-LK1 (BU) short to power
- circuit 64S-LK9 (BU/WH) short to power
- circuit 64S-LK11 (BU) short to power
- circuit 64S-LK21 (BU/BK) short to power
- circuit 64S-LK29 (BU/RD) short to power
- circuit 64S-LK34 (BU/BK) short to power
- CJB
- interior auxiliary junction box
- joint connector 3
- FEM
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