Inspection Procedure

CHECK CAN COMMUNICATION SYSTEM

Check if CAN communication DTC is output (See DIAGNOSIS SYSTEM ).

Result

RESULT CHART

Result	Proceed to
CAN communication DTC is not output	A
CAN communication DTC is output	B

B: GO TO CAN COMMUNICATION SYSTEM

A: Go to Next Step

CHECK AIR CONDITIONING SYSTEM
1. Check the heater control panel illumination.
  OK:
  
  The heater control panel illumination operates normally.
NG: GO TO AIR CONDITIONING SYSTEM

OK: Go to Next Step

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.
Engine switch on (IG).
Turn the tester ON.
Light control switch TAIL/HEAD.
Enter the following menus: DIAGNOSIS / BODY / MAIN BODY / ACTIVE TEST.

Check the clock illumination.

MAIN BODY:

ITEM TEST DETAIL

Item	Test Details	Diagnostic Note
DIMMER SIG	Auto dimmer signal ON/OFF	-

OK:

The clock illumination is dimmed when the DIMMER SIG is ON.

HINT:

Refer to the sensitivity setting in the customization table of the automatic light control system (See CUSTOMIZE PARAMETERS ).

NG: Go to step 4

OK: REPLACE MAIN BODY ECU

CHECK HARNESS AND CONNECTOR (ILL+)

Disconnect the E3 (*1)/E18 (*2) connector.

Measure the voltage according to the value(s) in the table below.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection

Condition

Specified Condition

E3-11 (ILL+) (⁽¹⁾) - Body ground

Engine switch on (IG), light control switch TAIL/HEAD

10 to 14 V

E18-6 (ILL+) (⁽²⁾) - Body ground

Engine switch on (IG), light control switch TAIL/HEAD

10 to 14 V

⁽¹⁾	without Navigation System

⁽²⁾	with Navigation System

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 1: Identifying Clock Assembly Wire Harness Connector E3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (CLOCK ASSEMBLY - COMBINATION METER)

Disconnect the E19 connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection

Condition

Specified Condition

E3-17 (ILL-) (⁽¹⁾) - E19-11 (ILL-)

Always

Below 1 Ω

E18-7 (ILL-) (⁽²⁾) - E19-11 (ILL-)

Always

Below 1 Ω

E19-11 (ILL-) - Body ground

Always

10 kΩ or higher

⁽¹⁾	without Navigation System

⁽²⁾	with Navigation System

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 2: Identifying Clock Assembly E19 Connector

OK: Go to Next Step

INSPECT CLOCK ASSEMBLY

Reconnect the E19 connector.

Check the waveform shown in the illustration below.

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
E19-11 (ILL-) - Body ground	Turn the engine switch on (IG), light control switch TAIL/ HEAD	Pulse generation (See 1waveform)

Fig 3: Identifying Combination Meter Assembly E19 Connector

Waveform (Reference): Using oscilloscope:

ITEM CONDITION CHART

Item	Condition
Tool setting	2V/DIV, 1 ms./DIV
Vehicle condition	Turn the engine switch on (IG), light control switch TAIL/HEAD

Fig 4: Identifying Signal Waveform

HINT:

Duty ratio changes as the illumination becomes darker (the period "A" shown in the illustration becomes longer).

Result

RESULT CHART

Result	Proceed to
NG (without Navigation System)	A
NG (with Navigation System)	B
OK	C

HINT:

The whole heater control panel/multi-display should be replaced if the clock assembly has a malfunction because this part is not independently supplied.

A: REPLACE HEATER CONTROL PANEL

B: REPLACE MULTI-DISPLAY

C: REPLACE COMBINATION METER ASSEMBLY