Headup Display Malfunction [10/2014 - 09/2017]: Procedure

1. Check the symptom of the headup display.

   Result

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

Result: 

B 

See step  5

Result: 

A 

See step  2

1. Disconnect the combination meter mirror ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Combination Meter Mirror ECU)

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   J5-1 (IG) - Body ground	Power switch on (IG)	11 to 14 V
   J5-2 (B) - Body ground	Power switch off	11 to 14 V
   J5-5 (ACC) - Body ground	Power 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
   J5-4 (ES) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Remove the headup display switch assembly.

   Refer to REMOVAL [10/2014 - ]

2. Inspect the headup display switch assembly.

   Refer to INSPECTION [10/2014 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE HEADUP DISPLAY SWITCH ASSEMBLY. Refer to  REMOVAL [10/2014 - ] 

Result: 

OK 

See step  4

1. Disconnect the J5 combination meter mirror ECU connector.
2. Disconnect the I70 headup display switch assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J5-10 (SW2) - I70-10 (ILD)	Always	Below 1 Ω
   J5-9 (SW1) - I70-12 (ILU)	Always	Below 1 Ω
   J5-16 (E) - I70-6 (CH)	Always	Below 1 Ω
   J5-10 (SW2) or I70-10 (ILD) - Body ground	Always	10 kΩ or higher
   J5-9 (SW1) or I70-12 (ILU) - Body ground	Always	10 kΩ or higher
   J5-16 (E) or I70-6 (CH) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COMBINATION METER MIRROR ECU. Refer to  REMOVAL [10/2014 - 09/2017] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Confirm DTC output.

   Refer to SYSTEM DESCRIPTION [10/2014 - 09/2015] , or refer to SYSTEM DESCRIPTION [09/2015 - 09/2017]

   Result

   Result	Proceed to
   DTC is not output	A
   DTC (01, 02) is output	B
   DTC (03, 04) is output (except 8 Speakers)	C
   DTC (03, 04) is output (for 8 Speakers)	D

Result: 

A 

REPLACE COMBINATION METER MIRROR ECU. Refer to  REMOVAL [10/2014 - 09/2017] 

Result: 

C 

See step  9

Result: 

D 

See step  11

Result: 

B 

See step  6

1. Disconnect the J5 combination meter mirror ECU connector.
2. Disconnect the I10 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J5-6 (TX-) - I10-32 (TX+)	Always	Below 1 Ω
   J5-7 (CS) - I10-33 (CS)	Always	Below 1 Ω
   J5-6 (TX-) or I10-32 (TX+) - Body ground	Always	10 kΩ or higher
   J5-7 (CS) or I10-33 (CS) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

1. Remove the combination meter mirror ECU with the connector(s) still connected.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Combination Meter Mirror ECU)
   *b	Waveform

2. Connect an oscilloscope to terminal J5-6 (TX-) and body ground.
3. Check the signal waveform according to the condition(s) in the table below.
   MEASUREMENT CONDITION
   
   

   Item	Condition
   Tester connection	J5-6 (TX-) - Body ground
   Tool setting	5 V/DIV., 200 μs./DIV.
   Vehicle condition	Power switch on (IG)

   OK

   The waveform displayed is as shown in the illustration.

   HINT: 

   The period of the signal changes depending on the communication state.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2014 - 09/2017] 

Result: 

OK 

See step  8

1. Remove the combination meter mirror ECU with the connector(s) still connected.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Combination Meter Mirror ECU)
   *b	Waveform

2. Connect an oscilloscope to terminal J5-7 (CS) and body ground.
3. Check the signal waveform according to the condition(s) in the table below.
   MEASUREMENT CONDITION
   
   

   Item	Condition
   Tester connection	J5-7 (CS) - Body ground
   Tool setting	5 V/DIV., 2 ms./DIV.
   Vehicle condition	Power switch on (IG)

   HINT: 

   The period of the signal changes depending on the communication state.

   OK

   The waveform displayed is as shown in the illustration.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COMBINATION METER MIRROR ECU. Refer to  REMOVAL [10/2014 - 09/2017] 

Result: 

NG 

REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2014 - 09/2017] 

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [10/2014 - 09/2017]

   Body Electrical > Navigation System > Trouble Codes 

   OK

   No DTCs are output.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO NAVIGATION SYSTEM. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2014 - 09/2017] 

Result: 

OK 

See step  10

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [10/2014 - 09/2017]

   Body Electrical > Navigation System > Trouble Codes 

   OK

   No DTCs are output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COMBINATION METER MIRROR ECU. Refer to  REMOVAL [10/2014 - 09/2017] 

Result: 

NG 

GO TO AUDIO AND VISUAL SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 09/2017] 

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [10/2014 - 09/2017]

   Body Electrical > Navigation System > Trouble Codes 

   OK

   No DTCs are output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COMBINATION METER MIRROR ECU. Refer to  REMOVAL [10/2014 - 09/2017] 

Result: 

NG 

GO TO AUDIO AND VISUAL SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 09/2017]