Test Q

PINPOINT TEST Q: ONE TURN SIGNAL LAMP IS INOPERATIVE

Test Q1:

Test Q1-Q2:

Test Q2 Continued:

Test Q3-Q5:

Normal Operation
Power is supplied from the central junction box (CJB) to the LH front turn signal lamp through circuits 29S-LF3 (OG/YE) and 29S-LF7 (OG/BU). The ground for the LH front turn signal lamp is passed through circuit 31S-LG18 (BK/YE) and then through circuit 31S-LG11 (BK/WH) to the front electronic module (FEM). Power is supplied from the CJB to the RH front turn signal lamp through circuits 29S-LF4 (OG/BU) and 29S-LF16 (OG/GN). The ground for the RH front turn signal lamp is passed through circuit 31S-LG18 (BK/YE) to the FEM. Power is supplied from the battery junction box (BJB) to the LH rear turn signal lamp through circuits 29S-LG1 (OG/YE) and 29S-LG12 (OG/YE). The ground for the LH rear turn signal lamp is passed through circuit 31S-LG12 (BK/YE) to the rear electronic module (REM). Power is supplied from the BJB to the RH rear turn signal lamp through circuits 29S-LG2 (OG/BU), 29S-LG19 (OG/BU) and 29S-LG12 (OG/YE). The ground for the RH rear turn signal lamp is passed through circuit 31S-LG12 (BK/YE) and then through circuit 31S-LG19 (BK/BU) to the REM. The FEM and REM individually control the ground circuits for the turn signal lamps. The timed on/off cycle is determined in the instrument cluster programming and is set to flash approximately 80 times per minute if both the front and rear turn signal lamps are good. If only one turn signal lamp is good, the instrument cluster will flash the remaining working turn signal lamp(s) approximately 160 times per minute.

Possible Causes
- circuit 29S-LF3 (OG/YE) open
- circuit 29S-LF7 (OG/BU) open
- circuit 31S-LG18 (BK/YE) open or short to power
- circuit 31S-LG11 (BK/WH) open or short to power
- circuit 29S-LF4 (OG/BU) open
- circuit 29S-LF16 (OG/GN) open
- circuit 29S-LG1 (OG/YE) open
- circuit 29S-LG12 (OG/YE) open
- circuit 31S-LG12 (BK/YE) open or short to power
- circuit 29S-LG2 (OG/BU) open
- circuit 29S-LG19 (OG/BU) open
- circuit 31S-LG19 (BK/BU) open or short to power
- FEM
- REM