Headlight Dimmer Switch Circuit [10/2015 - ]: Procedure
- READ VALUE USING TECHSTREAM
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG).
- Turn the Techstream on.
- Enter the following menus: Body Electrical / Main Body / Data List.
- Read the Data List according to the display on the Techstream.MAIN BODY
Tester Display Measurement Item/Range Normal Condition Diagnostic Note Dimmer SW Dimmer switch high position signal/ON or OFF ON: Dimmer switch in high or high flash position
OFF: Dimmer switch in low position- Passing Light SW Dimmer switch high flash position (pass) signal/ON or OFF ON: Dimmer switch in high flash position
OFF: Dimmer switch not in high flash position- Auto Light SW Light control switch AUTO position signal/ON or OFF ON: Light control switch in AUTO position
OFF: Light control switch not in AUTO position- Head Light SW (Head) Light control switch head position signal/ON or OFF ON: Light control switch in head position
OFF: Light control switch not in head position- Head Light SW (Tail) Light control switch tail position signal/ON or OFF ON: Light control switch in tail or head position
OFF: Light control switch in neither tail nor head position- OK
Normal conditions listed above are displayed.
Result:
OK
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
(Refer to PROBLEM SYMPTOMS TABLE [10/2015 - ] )
Result:
NG
See step 2
- INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY
HINT:
Inspect the items that did not change as a result of monitoring the Data List.
- Remove the headlight dimmer switch assembly (Refer to REMOVAL [10/2014 - ] ).
- Measure the resistance according to the value(s) in the table below.
*a Component without harness connected
(Headlight Dimmer Switch Assembly)Standard Resistance
LIGHT CONTROL SWITCHTester Connection Condition Specified Condition 18 (T) - 15 (EL) Light control switch off*1 or DRL OFF*2 10 kΩ or higher 19 (H) - 15 (EL) Light control switch off*1 or DRL OFF*2 10 kΩ or higher 20 (A) - 15 (EL) Light control switch off*1 or DRL OFF*2 10 kΩ or higher 18 (T) - 15 (EL) Light control switch in tail position Below 1 Ω 18 (T) - 15 (EL) Light control switch in head position Below 1 Ω 19 (H) - 15 (EL) Light control switch in head position Below 1 Ω 20 (A) - 15 (EL) Light control switch in AUTO position Below 1 Ω DIMMER SWITCHTester Connection Condition Specified Condition 14 (HU) - 15 (EL) Dimmer switch in low position 10 kΩ or higher 14 (HU) - 15 (EL) Dimmer switch in high position Below 1 Ω 14 (HU) - 15 (EL) Dimmer switch in high flash position Below 1 Ω 17 (HF) - 15 (EL) Dimmer switch in high flash position Below 1 Ω - *1: w/o DRL OFF Switch
- *2: w/ DRL OFF Switch
Result:
NG
REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY
(Refer to REMOVAL [10/2014 - ] )
Result:
OK
See step 3
- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - HEADLIGHT DIMMER SWITCH ASSEMBLY)
- Disconnect the D6 main body ECU (multiplex network body ECU) connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition D18-14 (HU) - D6-5 (HU) Always Below 1 Ω D18-17 (HF) - D6-8 (HF) Always Below 1 Ω D18-18 (T) - D6-30 (TAIL) Always Below 1 Ω D18-19 (H) - D6-29 (HEAD) Always Below 1 Ω D18-20 (A) - D6-28 (A) Always Below 1 Ω D18-14 (HU) - Body ground Always 10 kΩ or higher D18-17 (HF) - Body ground Always 10 kΩ or higher D18-18 (T) - Body ground Always 10 kΩ or higher D18-19 (H) - Body ground Always 10 kΩ or higher D18-20 (A) - Body ground Always 10 kΩ or higher D18-15 (EL) - Body ground Always Below 1 Ω
Result:
OK
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
(Refer to REMOVAL [10/2014 - ] )
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR