Snowmobile Yamaha Phazer PZ50W, PZ50GTW, PZ50FXW, PZ50MW, PZ50VTW, PZ50MPW. Instruction - part 83

8-44

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ELEC

GRIP WARMER SYSTEM

TROUBLESHOOTING

Check the main fuse and ignition fuse.
Refer to “FUSE INSPECTION” in CHAPTER 2.

Check the battery.
Refer to “BATTERY INSPECTION” in CHAPTER 2.

Check the stator coil.
Refer to “CHARGING SYSTEM”.

Check the engine stop switch and main switch.
Refer to “IGNITION SYSTEM”.

Check the grip and thumb warmer.

Check the grip/thumb warmer adjustment switch.

Check the load control relay.
Refer to “LIGHTING SYSTEM”.

Check the grip warmer system’s wiring.
Refer to “CIRCUIT DIAGRAM”.

Correct the connection and/or replace the 
speedometer unit, rectifier/regulator, and/or ECU.

GRIP WARMER AND THUMB WARMER DO NOT OPERATE.

OK

FAULTY

Replace the main fuse and/or ignition fuse.

OK

OUT OF SPECIFICATION

Replace and/or charge the battery.
Refer to “BATTERY INSPECTION” in CHAPTER 
2.

OK

OUT OF SPECIFICATION

Replace the stator coil assembly.

OK

NO CONTINUITY

Replace the right handlebar switch and/or main 
switch.

OK

NO CONTINUITY

Replace the grip and/or thumb warmer.

CORRECT

NO CONTINUITY

Replace the left handlebar switch.

OK

FAULTY

Replace the load control relay.

OK

FAULTY

Properly connect or repair the grip warmer sys-
tem’s wiring.

8-45

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+

ELEC

GRIP WARMER SYSTEM

Check the main fuse, ignition fuse, and signal fuse.
Refer to “FUSE INSPECTION” in CHAPTER 2.

Check the battery.
Refer to “BATTERY INSPECTION” in CHAPTER 2.

Check the stator coil.
Refer to “CHARGING SYSTEM”.

Check the engine stop switch and main switch.
Refer to “IGNITION SYSTEM”.

Check the passenger grip warmer.

Check the passenger grip warmer switch.

Check the passenger grip warmer relay.

Check the load control relay.
Refer to “LIGHTING SYSTEM”.

Check the grip warmer system’s wiring.
Refer to “CIRCUIT DIAGRAM”.

Correct the connection and/or replace the rectifier/
regulator and/or ECU.

PASSENGER GRIP WARMER DOES NOT OPERATE. (PZ50VT)

OK

FAULTY

Replace the main fuse, ignition fuse, and/or signal 
fuse.

OK

OUT OF SPECIFICATION

Replace and/or charge the battery.
Refer to “BATTERY INSPECTION” in CHAPTER 
2.

OK

OUT OF SPECIFICATION

Replace the stator coil assembly.

OK

NO CONTINUITY

Replace the right handlebar switch and/or main 
switch.

OK

NO CONTINUITY

Replace the passenger grip warmer.

OK

NO CONTINUITY

Replace the passenger grip warmer switch.

OK

FAULTY

Replace the passenger grip warmer relay.

OK

FAULTY

Replace the load control relay.

OK

FAULTY

Properly connect or repair the grip warmer sys-
tem’s wiring.

8-46

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ELEC

GRIP WARMER SYSTEM

GRIP AND THUMB WARMER

1. Disconnect:

• Grip warmer coupler
• Thumb warmer coupler

2. Connect:

• Pocket tester

(to the grip warmer coupler and/or thumb
warmer coupler)

3. Measure:

• Grip warmer resistance 1 
• Thumb warmer resistance 2 

Out of specification 

→ Replace.

Grip warmer resistance:

PZ50/PZ50GT/PZ50M/PZ50VT/
PZ50MP:

1.53 ~ 1.87 

Ω at 20 °C (68 °F)

(Black – Black)

PZ50FX:

6.12 ~ 7.48 

Ω at 20 °C (68 °F)

(Black – Black)

Thumb warmer resistance:

37.0 ~ 45.2 

Ω at 20 °C (68 °F)

(White – Black)

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Ω × 1

2

1

W

B

B

B

GRIP/THUMB WARMER ADJUSTMENT 
SWITCH

1. Disconnect:

• Grip/thumb warmer adjustment switch coupler

2. Connect:

• Pocket tester

(to the grip/thumb warmer adjustment switch
coupler)

3. Check:

• Grip/thumb warmer adjustment switch conti-

nuity 
Faulty 

→ Replace the left handlebar switch.

Continuity

Switch 

position

Color code

Y/W

B/L

Y/L

THUMB

OFF

GRIP

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ELEC

GRIP WARMER SYSTEM

PASSENGER GRIP WARMER (PZ50VT)

1. Disconnect:

• Passenger grip warmer coupler

2. Connect:

• Pocket tester

(to the passenger grip warmer coupler)

3. Measure:

• Passenger grip warmer resistance

Out of specification 

→ Replace.

Passenger grip warmer resistance 
(high):

8.82 ~ 10.78 

Ω (Green – Black)

Passenger grip warmer resistance 
(low):

14.67 ~17.93 

Ω (Yellow – Black)

+

–

Ω × 1

G

Y

B

PASSENGER GRIP WARMER SWITCH 
(PZ50VT)

1. Disconnect:

• Passenger grip warmer switch coupler

2. Connect:

• Pocket tester

(to the passenger grip warmer switch coupler)

3. Check:

• Passenger grip warmer switch continuity 

Faulty 

→ Replace.

Continuity

Switch 

position

Color code

G/R

O/B

Y/L

LO

OFF

HI

+

–

Ω × 1

G/R

Y/L

O/B

+

–

Ω × 1

G/R

Y/L

O/B