Inspection Procedure

WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

Check Light
1. Check that headlamp and taillight light up.
1. NG : Flow Chart (Go To Flow Chart Of Headlight Or Taillight)
2. OK : Go to Next Step

Inspect Headlamp Dimmer Switch Assy

Inspect light control switch continuity.

Fig 1: Inspecting Headlamp Dimmer Switch Assy

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check that there is a continuity between terminals at each switch position as shown in the chart.

Standard:

HEADLAMP DIMMER SWITCH CONNECTOR TERMINALS SPECIFIED CONDITIONS

Switch Operation	Tester Connection	Specified Condition
OFF	-	No continuity
TAIL	14 - 16	Continuity
HEAD	13 - 16 - 14	Continuity
AUTO	16 - 12	Continuity

NG : Replace Headlamp Dimmer Switch Assy
OK : Go to Next Step

Check Automatic Light Control Sensor

Fig 2: Identifying Automatic Light Control Sensor Terminals

Measure voltage between terminals as shown in the chart below.
Check the continuity between terminal 3 (CLTE) and body ground as shown in the chart below.
Using an oscilloscope, check that signal waveform appears between terminals.

Standard:

AUTOMATIC LIGHT CONTROL SENSOR CONNECTOR TERMINALS SPECIFIED CONDITIONS

Terminal No. (Symbol)	Tester Connection	Condition	Specified Condition
1 (CLTB)	1 - 3	Constant	10 - 14 V
3 (CLTE)	3 - Body Ground	Constant	Continuity
4 (CLTS)	4 - 3	IG SW ON Dimmer SW AUTO	Signal waveform appears depending on outside brightness

NG : Replace Automatic Light Control Sensor
OK : Go to Next Step

Check Harness And Connector (Between Multiplex Network Body ECU And Automatic Light Control Sensor)
1. Check that signal waveform appears between terminal B6-4 (CLTS) and B6-21 (CLTE) of the multiplex network body ECU.
  Standard: Bar appears
2. Measure voltage between terminals B6-6 (CLTB) and B6-21 (CLTE) of the multiplex network body ECU.
  Standard: 10-14 V
3. Check the continuity between terminal B6-21 (CLTE) of the multiplex network body ECU and body ground.
  Standard: There is continuity
1. NG : Repair Or Replace Harness Or Connector
2. OK : Check And Replace Multiplex Network Body ECU