Yamaha XV1700P Service Manual page 426

Symptom The headlight does not turn ON or OFF.
Probable mal- • Malfunction in the headlight relay
function area • Malfunction in the headlight
• Open or short circuit in the headlight wiring harness
• Malfunction in the handlebar switch
• Open circuit in the headlight bulb
Inspection method 1
Inspection by diagnosis mode
• Execute diagnostic code No. 52 (check the
operation of the headlight relay).
(Check the operation of the headlight.)
* Classify the malfunctions:
Malfunction related to the relay
Malfunction related to the wiring harness
Malfunction in the headlight itself
Symptom Clock LCD displays "Er-1". (No signals are received from the ECU.)
Probable mal- • Open or short circuit in communication line
function area • Malfunction in meter
• Malfunction in ECU
Inspection method 1
Inspection by diagnosis mode
FUEL INJECTION SYSTEM
Inspection method 2
Inspection of a malfunction that cannot be identified in the
diagnosis mode, and in case the area of the malfunction has
been narrowed down in the inspection method 1.
• Relay does not operate (as checked by sound or tester).
Check the headlight relay.
Refer to "LIGHTING SYSTEM" in chapter 7.
Defective: replace
Inspect the wiring harness and the couplers for continuity.
Defective: repair or replace
Replace
• The relay operates but the headlight does not illuminate.
Inspect the headlight bulb.
Blown bulb: replace
Check the headlight relay contact point for continuity.
Refer to "LIGHTING SYSTEM" in chapter 7.
Defective: replace
Check the handlebar switch.
Defective: repair or replace
Inspect the wiring harness and the couplers for continuity.
Defective: repair or replace
Inspection method 2
Inspection of a malfunction that cannot be identified in the
diagnosis mode, and in case the area of the malfunction has
been narrowed down in the inspection method 1 given on the
left.
• Inspect ECU coupler
Inspect the wiring harness and couplers for continuity.
Defective: repair or replace
• Inspect meter coupler
Inspect the wiring harness and couplers for continuity.
Defective: repair or replace
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FI