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   9 

A: Go to next step 

1. Confirm the vehicle model.

   Result

   Result	Proceed to
   w/o Multi-information Display	A
   w/ Multi-information Display	B

B → See step   5 

A: Go to next step 

1. Disconnect E1 and E20 connectors.
   Fig 1: Identifying Clock Assembly & Combination Meter Connector Terminals

   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
   E20-3 (ILL+) - E1-30 (ILL-)	Always	Below 1 Ω
   E1-30 (ILL-) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the E20 connector.
   Fig 2: Identifying Combination Meter Connector Terminals

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

   Standard voltage

   Tester Connection	Condition	Specified Condition
   E1-30 (ILL-) - Body ground	Ignition switch on (IG), headlight dimmer switch TAIL or HEAD	11 to 14 V
   E1-30 (ILL-) - Body ground	Ignition switch on (IG), headlight dimmer switch OFF	Below 1 V

NG → See step   10 

OK → See step   11 

1. Check if any DTC is output, refer to DIAGNOSIS SYSTEM .

   Result

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

B → See step   12 

A: Go to next step 

1. Connect Techstream to the DLC3.
2. Ignition switch on (IG).
3. Turn the tester ON.
4. Enter the following menus: Body Electrical / Main Body / Data List.
5. Check the clock illumination.
   MAIN BODY
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Illumination Rate Info	Illumination rate information / 0 ms. to 99 ms.	0.8 to 22.0 ms to (Value is output according to outside illuminance)	Confirm that the vehicle is stopped, engine idling

   OK

   The value changes according to the illuminance.

   HINT: 

   Refer to the sensitivity setting in the customization table of the lighting system, refer to CUSTOMIZE PARAMETERS .

NG → See step   7 

OK → See step   13 

1. Disconnect the E1 and E11 connectors.
   Fig 3: Identifying Clock Assembly & Combination Meter Connector Terminals

   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 connector.
   Fig 4: 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	Condition	Specified Condition
   E11-9 (CLK) - Body ground	Ignition switch on (IG), headlight dimmer switch TAIL or HEAD	Pulse generation
   E11-10 (DATA) - Body ground	Ignition switch on (IG), headlight dimmer switch TAIL or HEAD	Pulse generation
   E11-11 (SYNC) - Body ground	Ignition switch on (IG), headlight dimmer switch TAIL or HEAD	Pulse generation
   E11-9 (CLK) - Body ground	Ignition switch on (IG), headlight dimmer switch OFF	Below 1 V
   E11-10 (DATA) - Body ground	Ignition switch on (IG), headlight dimmer switch OFF	Below 1 V
   E11-11 (SYNC) - Body ground	Ignition switch on (IG), headlight dimmer switch OFF	Below 1 V

NG → See step   11 

OK → See step   10