Headup Display Malfunction: Procedure

1. Check the symptom of the headup display.

   Result

   Result	Proceed to
   Headup display does not operate at all.	A
   Cruise information display does not change.	B

B → See step   5 

A: Go to next step 

1. Disconnect the H1 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
   H1-1 (IG) - Body ground	Engine switch on (IG)	11 to 14 V
   H1-2 (B) - Body ground	Always	11 to 14 V
   H1-3 (ACC) - Body ground	Engine switch on (ACC)	11 to 14 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H1-5 (ES) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Headup Display)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the H1 and F23 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
   H1-14 (HUDO) - F23-7 (CH)	Always	Below 1 Ω
   H1-14 (HUDO) - Body ground	Always	10 kΩ or higher
   H1-15 (HUDU) - F23-6 (HDU)	Always	Below 1 Ω
   H1-15 (HUDU) - Body ground	Always	10 kΩ or higher
   H1-16 (HUDD) - F23-5 (HDD)	Always	Below 1 Ω
   H1-16 (HUDD) - Body ground	Always	10 kΩ or higher
   H1-12 (ILU) - F23-4 (ILU)	Always	Below 1 Ω
   H1-12 (ILU) - Body ground	Always	10 kΩ or higher
   H1-13 (ILD) - F23-3 (ILD)	Always	Below 1 Ω
   H1-13 (ILD) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Headup Display)
   *2	Front view of wire harness connector (to Satellite Switch Set)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the H1 connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   2 (E) - 3 (ILD)	Display contrast down switch pressed	Below 1 Ω
   2 (E) - 3 (ILD)	Display contrast down switch not pressed	10 kΩ or higher
   2 (E) - 4 (ILU)	Display contrast up switch pressed	Below 1 Ω
   2 (E) - 4 (ILU)	Display contrast up switch not pressed	10 kΩ or higher
   2 (E) - 5 (HDD)	Headup display position down switch pressed	Below 1 Ω
   2 (E) - 5 (HDD)	Headup display position down switch not pressed	10 kΩ or higher
   2 (E) - 6 (HDU)	Headup display position up switch pressed	Below 1 Ω
   2 (E) - 6 (HDU)	Headup display position up switch not pressed	10 kΩ or higher
   2 (E) - 7 (CH)	Headup display on switch pressed	Below 1 Ω
   2 (E) - 7 (CH)	Headup display on switch not pressed	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Satellite Switch Set)

NG → See step   14 

OK → See step   15 

1. Confirm the symptoms.

   Result

   Result	Proceed to
   All the display malfunction	A
   Vehicle speed display malfunction
   Dynamic radar cruise control display malfunction
   Pre-collision system display malfunction
   Navigation display malfunction	B

B → See step   9 

A: Go to next step 

1. Check for DTCs. Refer to ON-VEHICLE INSPECTION [03/2012 - 07/2012] .

   Result

   Result	Proceed to
   DTC is output.	A
   DTC is not output.	B

B → See step   8 

A: Go to next step 

1. Disconnect the F16 and H1 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
   F16-18 (TX+) - H1-6 (TX-)	Always	Below 1 Ω
   F16-18 (TX+) - Body ground	Always	10 kΩ or higher
   F16-20 (CS) - H1-8 (CS)	Always	Below 1 Ω
   F16-20 (CS) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Combination Meter Assembly)
   *2	Front view of wire harness connector (to Headup Display (Combination Meter Mirror ECU))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the headup display with a new or a known good one. Refer to REMOVAL [03/2012 - 07/2012] .

   OK

   The operation of the headup display returns to normal.

NG → See step   13 

OK → END 

1. Check for DTCs. Refer to ON-VEHICLE INSPECTION [03/2012 - 07/2012] .

   Result

   Result	Proceed to
   DTC is output.	A
   DTC is not output.	B

B → See step   11 

A: Go to next step 

1. Disconnect the F16 and H1 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
   F16-18 (TX+) - H1-6 (TX-)	Always	Below 1 Ω
   F16-18 (TX+) - Body ground	Always	10 kΩ or higher
   F16-20 (CS) - H1-8 (CS)	Always	Below 1 Ω
   F16-20 (CS) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Combination Meter Assembly)
   *2	Front view of wire harness connector (to Headup Display (Combination Meter Mirror ECU))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the combination meter assembly to a new or a normal one. Refer to REMOVAL [03/2012 - 07/2012] .

   Result

   The operation of the headup display returns to normal.

NG → See step   12 

OK → END 

1. Replace the headup display to a new or a normal one. Refer to REMOVAL [03/2012 - 07/2012] .

   OK

   The operation of the headup display (combination meter mirror ECU) returns to normal.

NG → See step   16 

OK → END