Pinpoint Tests, Turn Signal Lamps/Hazard Flasher Lamps

NOTE: Use Rotunda 73 Digital Multimeter 105-R0051 or equivalent when performing electrical pinpoint tests.

PINPOINT TEST J: ALL TURN SIGNAL LAMPS/HAZARD FLASHER LAMPS INOPERATIVE

J1 CHECK FUSES

• Check turn/hazard flasher fuse 7 and fuse 13 for continuity.

J2 CHECK VOLTAGE FEED SIDE FUSE 7

• Key in RUN.
• Check for voltage at turn flasher fuse 7, Circuit 687 (GY/Y), feed side.

J3 CHECK VOLTAGE FEED SIDE FUSE 13

• Key OFF.
• Check for voltage at hazard flasher fuse 13, Circuit 38 (BK/O), feed side.

J4 CHECK CONTINUITY OF CIRCUIT 38 (BK/O)

• Disconnect battery ground cable.
• Check for continuity on Circuit 38 (BK/O) between IP fuse panel fuse 13 and power distribution box fuse 13.

J5 CHECK TURN/HAZARD FLASHER FEEDS

• Disconnect battery ground cable.
• Check continuity of Circuit 8 (O/Y) between IP fuse panel fuse 7 and turn flasher, Circuit 383 (R/W) between IP fuse panel fuse 13 and hazard flasher.

J6 CHECK INDICATOR FLASHER

• Reconnect battery ground cable.
• Restore vehicle.
• Substitute a known good indicator flasher.

J7 CHECK MULTI-FUNCTION SWITCH FEEDS

• Disconnect battery ground cable.
• Check continuity of Circuit 44 (LB) between turn flasher and multi-function switch Pin C1-1, Circuit 385 (R/W) between hazard flasher and multi-function switch Pin C1-4.

J8 CHECK MULTI-FUNCTION SWITCH TURN CONTINUITY

• Disconnect battery ground cable.
• Remove multi-function switch. Refer to Section 11-05 for removal procedure.
• Actuate multi-function switch to the left and right turn positions and check continuity between Pin C1-1, Circuit 44 (LB) and:
• LEFT Pin C1-8, Circuit 3 (LG/W)
• Pin C1-10, Circuit 9 (LG/O)
• RIGHT Pin C1-5, Circuit 2 (W/LB)
• Pin C1-2, Circuit 5 (O/LB)

J9 CHECK MULTI-FUNCTION SWITCH HAZARD CONTINUITY

• Disconnect battery ground cable.
• Remove multi-function switch. Refer to Section 11-05 for removal procedure.
• Actuate multi-function switch to the hazard position and check continuity between Pin C1-4, Circuit 385 (R/W) and:
• Pin C1-2, Circuit 5 (O/LB)
• Pin C1-10, Circuit 9 (LG/O)
• Pin C1-5, Circuit 2 (W/LB)
• Pin C1-8, Circuit 3 (LG/W)

J10 CHECK LAMP FEED WIRING

• Disconnect battery ground cable.
• Install multi-function switch. Refer to Section 11-05.
• Check continuity between multi-function switch circuit feed specified and the corresponding exterior lamp:
• Circuit 3 (LG/W) Left Front Turn Lamp
• Circuit 2 (W/LB) Right Front Turn Lamp
• Circuit 9 (LG/O) Left Rear Stop/Turn Lamp
• Circuit 5 (O/LB) Right Rear Stop/Turn Lamp

J11 CHECK MINIATURE BULBS

• Remove miniature bulbs.
• Check continuity of front turn lamps and rear stop/turn lamps.

J12 CHECK LAMP GROUNDS

• Disconnect battery ground cable.
• Check continuity of Circuit 57 (BK) at each front turn lamp and each rear stop/turn lamp with a known good ground.

PINPOINT TEST K: INDIVIDUAL TURN SIGNAL/FLASHER LAMP INOPERATIVE

K1 CHECK MULTI-FUNCTION SWITCH

• Connect Rotunda 73 Digital Multimeter 105-R0051 or equivalent to a known good ground and with the turn signal switch on, check for voltage at the multi-function switch on the following circuits.
• LH Front  3 (LG/W) Pin C1-8
• RH Front  2 (W/LB) Pin C1-5
• LH Rear  9 (LG/O) Pin C1-10
• RH Rear  5 (O/LB) Pin C1-2

K2 CHECK FOR POWER TO SOCKETS

• Use Rotunda 73 Digital Multimeter 105-R0051 or equivalent to check for battery voltage to turn indicator bulb sockets with turn signal switch on.
• LH Front  3 (LG/W)
• RH Front  2 (W/LB)
• LH Rear  9 (LG/O)
• RH Rear  5 (O/LB)

K3 CHECK GROUND CIRCUIT

• Disconnect battery ground cable.
• Use Rotunda 73 Digital Multimeter 105-R0051 or equivalent to check the continuity of ground Circuit 57 (BK) at the suspect lamp.

PINPOINT TEST L: TURN SIGNAL LAMPS ON CONTINUOUSLY

L1 CIRCUIT INSPECTION

• Check all circuits involving the indicator system for short circuits to power. Refer to Section 13-01.

L2 CHECK MULTI-FUNCTION SWITCH

• Key OFF.
• Actuate turn signal to the OFF position. Using a Rotunda 73 Digital Multimeter, check Circuits 9 (LG/O) Pin C1-10 and 5 (O/LB) Pin C1-2 at the multi-function switch.

PINPOINT TEST M: ONE TURN SIGNAL LAMP INOPERATIVE

M1 CHECK MINIATURE BULB

• Check miniature bulb of inoperative turn signal lamp.

M2 CHECK FOR POWER

• With turn indicator in operating position, use Rotunda 73 Digital Multimeter 105-R0051 or equivalent to check voltage on affected circuit.

M3 CHECK GROUND CIRCUIT

• Using Rotunda 73 Digital Multimeter 105-R0051 or equivalent, check Circuit 57 (BK) at affected light.

PINPOINT TEST N: HAZARD FLASHER INOPERATIVE

N1 CHECK INDICATOR FLASHER

• Replace indicator flasher with known good flasher.

N2 CHECK POWER TO HAZARD FLASHER

• Using Rotunda 73 Digital Multimeter 105-R0051 or equivalent, check 15A fuse 13, Circuit 383 (R/W) for voltage to the hazard flasher.

N3 CHECK FOR VOLTAGE AT HAZARD FLASHER

• Actuate hazard flasher to the ON position.
• Check Circuit 385 (R/W) for voltage using Rotunda 73 Digital Multimeter 105-R0051 or equivalent at the multi-function switch.

N4 CHECK FOR VOLTAGE

• Using Rotunda 73 Digital Multimeter 105-R0051 or equivalent with hazard flasher on, check for voltage at the multi-function switch.
• LH Front Circuit  3 (LG/W) Pin C1-8
• LH Rear Circuit  9 (LG/O) Pin C1-10
• RH Front Circuit  2 (W/LB) Pin C1-5
• RH Rear Circuit  5 (O/LB) Pin C1-2

N5 CHECK HAZARD FLASHER GROUND

• Use Rotunda 73 Digital Multimeter 105-R0051 or equivalent to check ground circuits at the lamps.

PINPOINT TEST P: HAZARD FLASHERS ON CONTINUOUSLY

P1 HAZARD FLASHERS CIRCUIT INSPECTION

• Check all circuits around the hazard flasher system for short circuits to power.

P2 CHECK HAZARD SWITCH OPERATION

• Key in ON.
• Hazard switch in the OFF position. With a Rotunda 73 Digital Multimeter 105-R0051 or equivalent, check Circuit 9 (LG/O) Pin C1-10 and Circuit 5 (O/LB) Pin C1-2 at the multi-function switch.

PINPOINT TEST Q: HAZARD FLASHER LAMPS INOPERATIVE

Q1 CHECK STOPLAMPS

• Check stoplamps and turn signal lamp operation with indicator flasher.