Illumination Circuit: Procedure

1. Confirm the symptom.
   RESULT
   
   

   Result	Proceed to
   Only clock illumination has a malfunction.	A
   Clock illumination, combination meter assembly illumination, and heater control panel illumination have a malfunction.	B

B → See step   6 

A: Go to next step 

1. Check if any DTC is output.
   • w/ Smart Key System: Refer to DIAGNOSIS SYSTEM
   • w/o Smart Key System: Refer to DIAGNOSIS SYSTEM
   RESULT
   
   

   Result	Proceed to
   CAN communication DTC is not output	A
   CAN Communication DTC is output (w/ Smart Key System)	B
   CAN Communication DTC is output (w/o Smart Key System)	C

B → See step   9 

C → See step   11 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch ON.
3. Turn the Techstream on.
4. Turn the light control switch to the TAIL or HEAD position.
5. Enter the following menus: Body Electrical / Main Body / Active Test.
6. Check the clock illumination.
   MAIN BODY
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Dimmer signal	Dimmer signal	Dimmer signal is OFF/ON	Confirm that the vehicle is stopped, engine idling

   OK

   The clock illumination does not dim when turn the light control switch to the TAIL or HEAD position and the dimmer signal is ON.

   HINT: 

   Clock illumination is adjusted by automatic light control system and controlled according to the outside light. The automatic light control sensor sensitiveness can be customized. Therefore, when the Data List value is normal, confirm the sensitivity setting in the customization table of the automatic light control system. Refer to CUSTOMIZE PARAMETERS .

NG → See step   4 

OK → See step   10 

1. Disconnect the E1 meter and E11 clock connectors.
   Fig 1: Identifying E1 And E11 Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   E11-9 (CLK) - E1-36 (MCLK)	Always	Below 1 Ω
   E11-10 (DATA) - E1-37 (MDAT)	Always	Below 1 Ω
   E11-11 (SYNC) - E1-38 (SYNC)	Always	Below 1 Ω
   E1-36 (MCLK) - Body ground	Always	10 kΩ or higher
   E1-37 (MDAT) - Body ground	Always	10 kΩ or higher
   E1-38 (SYNC) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the E1 meter connector.
   Fig 2: Identifying E1 Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   E11-9 (CLK) - Body ground	Ignition switch ON, headlight dimmer switch TAIL or HEAD	Pulse generation
   E11-10 (DATA) - Body ground	Ignition switch ON, headlight dimmer switch TAIL or HEAD	Pulse generation
   E11-11 (SYNC) - Body ground	Ignition switch ON, headlight dimmer switch TAIL or HEAD	Pulse generation
   E11-9 (CLK) - Body ground	Ignition switch ON, headlight dimmer switch OFF	Below 1 V
   E11-10 (DATA) - Body ground	Ignition switch ON, headlight dimmer switch OFF	Below 1 V
   E11-11 (SYNC) - Body ground	Ignition switch ON, headlight dimmer switch OFF	Below 1 V

NG → See step   8 

OK → See step   7