Test A: One or More Module-Controlled Illumination Source(s) Is Inoperative

PINPOINT TEST A: ONE OR MORE MODULE-CONTROLLED ILLUMINATION SOURCE(S) IS INOPERATIVE

A1-A2:

A2-A3:

A3-A4:

A4-A6:

A6-A8:

A8-A10:

A10-A12:

A12-A14:

A14-A16:

A16-A17:

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 voltage through circuit 29S-DK22 (OG/YE) whenever the switched system power (SSP) relay number 2 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 pulse width modulation (PWM) voltage to the interior auxiliary junction box through circuit 64S-LH5 (BU/RD). The interior auxiliary junction box separates the PWM voltage and supplies it to sub-illumination sources through circuits 64S-LH4 (BU/RD), 64S-LH1 (BU/RD), 64S-LK9 (BU/RD), 64S-LH16 (BU/WH), 64S-LK1 (BU/RD), and the central junction box (CJB) through circuit 64S-AD2 (BU/RD). The CJB separates the PWM voltage and also supplies it to sub-illumination sources through circuits 64S-LH2 (BU/RD) and 64S-LH33 (BU/BK). The sub-illumination sources then provide the PWM voltage to the individual illuminating sources.

Possible Causes
- circuit 64-LK18 (BU/RD) open
- circuit 64S-AD2 (BU/RD) open
- circuit 64S-AH27 (BU) open
- circuit 64S-AL19 (BU/BK) open
- circuit 64S-CG15 (BU/WH) open
- circuit 64S-GG25 (BU/OG) open
- circuit 64S-LH1 (BU/RD) open
- circuit 64S-LH2 (BU/RD) open
- circuit 64S-LH3 (BU/WH) open
- circuit 64S-LH4 (BU/RD) open
- circuit 64S-LE10 (BU/YE) open
- circuit 64S-LH14 (BU) open
- circuit 64S-LH15 (BU) open
- circuit 64S-LH16 (BU/WH) open
- circuit 64S-LH16A (BU/WH) open
- circuit 64S-LH26 (BU/BK) open
- circuit 64S-LH28 (BU) open
- circuit 64S-LH31 (BU/RD) open
- circuit 64S-LH32 (BU/RD) open
- circuit 64S-LH33A (BU/BK) open
- circuit 64S-LH33 (BU/BK) open
- circuit 64S-LH42 (BU/RD) open
- circuit 64S-LH45 (BU/OG) open
- circuit 64S-LH49 (BU/BK) open
- circuit 64S-LH50 (BU/YE) open
- circuit 64S-LK1 (BU/RD) open
- circuit 64S-LK9 (BU/RD) open
- circuit 64S-LK21 (BU/BK) open
- circuit 64S-LK29 (BU/RD) open
- circuit 64S-LK34 (BU/BK) open
- circuit 31-AH27 (BK) open
- circuit 31-AJ7 (BK/BU) open
- circuit 31-AL19 (BK/GN) open
- circuit 31-HC15 (BK/YE) open
- circuit 31-HC18 (BK/GN) open
- circuit 31-LH16 (BK/OG) open
- circuit 31-LH26 (BK) open
- circuit 31-LH28 (BK) open
- circuit 31-LH31 (BK) open
- circuit 31-LH33 (BK/GN) open
- circuit 31-LH34 (BK/RD) open
- circuit 31-LH42 (BK) open
- circuit 31-LH45 (BK/WH) open
- circuit 31S-PG24 (BK/OG) open
- circuit 31-LH49 (BK/GN) open
- circuit 31-LK21 (BK/GN) open
- circuit 31-MD15A (BK/GN) open
- circuit 31-MD15B (BK/GN) open
- circuit 31S-PG1 (BK/BU) open
- circuit 31-AD12 (BK/YE) open
- circuit 31-CG15 (BK/OG) open
- circuit 31-LK34 (BK/GN) open
- circuit 31-GG25 (BK) open
- circuit 31-LK11 (BK) open
- circuit 10-LE10 (GY/BK) open
- CJB
- interior auxiliary junction box
- joint connector 3
- illumination source component