HEADLAMP — Headlamp Aiming Control — Trouble-diagnosis
EL-54flowchartUnverifiedSource spells the second table heading 'Switch positon' (likely 'position') — captured verbatim per never-guess. Step B continuity table also shows pin ① always closed (switch common) regardless of position.
Trouble-diagnosis
WARNING
SYMPTOM: Headlamp aiming does not operate.
1
Ⓐ POWER SUPPLY CIRCUIT CHECK (For aiming switch) — Check if 12 volts exist between terminals ① and ⑥.
N.G.
N.G. → Check 10A fuse at fuse block. (Refer to "POWER SUPPLY ROUTING".)
O.K.
2
Ⓑ AIMING SWITCH CHECK — Check continuity between terminals at each switch position.
N.G.
N.G. → Replace aiming switch.
O.K.
3
Ⓒ GROUND CIRCUIT CHECK FOR AIMING MOTOR — Check continuity between terminals ⑥ and body ground. Continuity exists ... O.K.
N.G.
N.G. → Repair harness between aiming motor and body ground.
O.K.
4
Ⓓ POWER SUPPLY CIRCUIT CHECK (For aiming motor unit) — Check if 12 volts exist between terminals ①, ②, ③, ④ and ⑥.
N.G.
N.G. → Check harness between aiming switch and aiming motor unit.
O.K.
5
Replace aiming motor unit.
Step A — Power supply at aiming switch
①
Voltmeter terminals (–)⑥
Voltage [V]Approx. 12
Step B — Aiming-switch continuity truth table
0
①○
②○
③
④
⑤
1
①○
②
③○
④
⑤
2
①○
②
③
④○
⑤
3
①○
②
③
④
⑤○
Step D — Power supply at aiming motor unit
①
(–)⑥
Voltage [V]Approx. 12
Aiming switch position"0"
①
(–)⑥
Voltage [V]0
Aiming switch positionExcept "0"
②
(–)⑥
Voltage [V]Approx. 12
Aiming switch position"1"
②
(–)⑥
Voltage [V]0
Aiming switch positionExcept "1"
③
(–)⑥
Voltage [V]Approx. 12
Aiming switch position"2"
③
(–)⑥
Voltage [V]0
Aiming switch positionExcept "2"
④
(–)⑥
Voltage [V]Approx. 12
Aiming switch position"3"
④
(–)⑥
Voltage [V]0
Aiming switch positionExcept "3"
See also
POWER SUPPLY ROUTING