Unit Inspection

WARNING: This page is about a different car, the 2014 Subaru BRZ. However, it is still accessible from the selected car via links, so may be relevant.

Inspection of the headlight leveling switch

Voltage ratio inspection

Disconnect the connector of the headlight leveling switch.
Measure the voltage between the vehicle wiring harness connector 8 (B) terminal and the 5 (E) terminal. (Voltage A)

Fig 1: Identifying Headlight Leveling Switch Connector Terminals
Courtesy of SUBARU OF AMERICA, INC.
Connect the connector of the headlight leveling switch.
Measure the voltage between connector terminals 7 (T) and 5 (E), and terminals 6 (T) and 5 (E) from back side of the connector when operating the headlight leveling switch. (Voltage B)

Fig 2: Headlight Leveling Switch Connector Terminals
Courtesy of SUBARU OF AMERICA, INC.

Divide voltage B by voltage A to calculate the voltage ratio.

Criteria

Switch position	Voltage ratio (%)
0	84.8 to 89
1	67.4 to 73.5
2	51.4 to 57.7
3	36.1 to 41.7
4	21.2 to 26
5	7.2 to 10.4

NOTE: If voltage A is 12 V and voltage B is 10.5 V, then 10.5÷12 = 0.875, and the voltage ratio is 87.5 %.

Inspection of LED light

Check the illumination status of the LED for headlight leveling switch when the battery voltage is applied between terminals.

Criteria

Battery connection	Criteria
Battery positive →3 Battery ground →2	Night-time illumination turns on.

Fig 3: Headlight Swtich Connector Terminals

Courtesy of SUBARU OF AMERICA, INC.