Speed Signal Circuit [11/2017 - ]: Procedure

1. Disconnect the combination meter assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   D145-3 (+S) - Body ground	Ignition switch ON	4.5 to 14 V

   HINT: 

   If any of the ECUs specified in the wiring diagram supplies power to the combination meter assembly, the combination meter assembly will output a waveform.

Result: 

NG 

See step  5

Result: 

OK 

See step  2

1. Disconnect the brake actuator assembly (skid control ECU) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Brake Actuator Assembly (Skid Control ECU))

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A75-14 (SP1) - Body ground	Ignition switch ON	11 to 14 V

Result: 

NG 

See step  4

Result: 

OK 

See step  3

1. Check the input waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Combination Meter Assembly)

   1. Remove the combination meter assembly with the connector(s) still connected.
   2. Connect an oscilloscope to terminal D145-4 (SI) and body ground.
   3. Turn the ignition switch to ON.
   4. Turn the wheel slowly.
   5. Check the signal waveform according to the condition(s) in the table below.

      Item	Condition
      Tool setting	5 V/DIV., 20 ms./DIV.
      Vehicle Condition	Ignition switch ON, wheel being rotated

      OK

      The waveform is similar to that shown in the illustration.

      HINT: 

      When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

Result: 

OK 

REPLACE COMBINATION METER ASSEMBLY 

Refer to REMOVAL [12/2015 - ]

Result: 

NG 

REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) 

Refer to REMOVAL [11/2017 - ]

1. Disconnect the A75 brake actuator assembly (skid control ECU) connector.
2. Disconnect the D145 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A75-14 (SP1) - D145-4 (SI)	Always	Below 1 Ω
   A75-14 (SP1) or D145-4 (SI) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE COMBINATION METER ASSEMBLY 

Refer to REMOVAL [12/2015 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the D145 combination meter assembly connector.
2. Disconnect the 2A instrument panel junction block assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D145-3 (+S) - 2A-30	Always	Below 1 Ω
   D145-3 (+S) or 2A-30 - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Inspect for a short in the circuit that is connected to the instrument panel junction block assembly connector shown in the wiring diagram.

   HINT: 

   If the voltage is not as specified, it is possible that an ECU or circuit has a malfunction. The malfunctioning ECU or circuit will be diagnosed in the following steps.

   1. Disconnect the 2A and 2F instrument panel junction block assembly connectors.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      *a	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)

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

      Standard Voltage

      Tester Connection	Switch Condition	Specified Condition
      2F-27 - Body ground	Ignition switch ON	4.5 to 14 V
      2A-29 - Body ground	Ignition switch ON	4.5 to 14 V
      2A-28 - Body ground	Ignition switch ON	4.5 to 14 V

   RESULT
   
   

   Result	Proceed to
   Voltage is not as specified in one circuit	A
   Voltage is as specified in all circuits	B

Result: 

B 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

Result: 

A 

See step  7

1. Select the circuit for which voltage was not as specified in the previous step 6.
   RESULT
   
   

   Tester Connection	System that Uses the Circuit	Proceed to
   2F-27 - Body ground	SFI system	A
   2A-29 - Body ground	Tire pressure warning system	B
   2A-28 - Body ground	Smart key system*1, wiper and washer system*2, separate type amplifier system*3, safety connect system*4, navigation system*5, audio and visual system*6	C

   1. *1: w/ Smart Key System
   2. *2: w/ Rain Sensor
   3. *3: for Separate Type Amplifier System
   4. *4: w/ Safety Connect System
   5. *5: w/ Navigation System
   6. *6: w/o Navigation System

Result: 

B 

See step  9

Result: 

C 

See step  10

Result: 

A 

See step  8

1. Disconnect the 2F instrument panel junction block assembly connector.
2. Disconnect the A69 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2F-27 - A69-39 (SPD)	Always	Below 1 Ω
   2F-27 or A69-39 (SPD) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE ECM 

Refer to REMOVAL [08/2016 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the 2A instrument panel junction block assembly connector.
2. Disconnect the D82 tire pressure warning ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2A-29 - D82-2 (SPD)	Always	Below 1 Ω
   2A-29 or D82-2 (SPD) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE TIRE PRESSURE WARNING ECU 

Refer to REMOVAL [12/2015 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the 2A instrument panel junction block assembly connector.
2. Disconnect the D175 junction connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2A-28 - D175-13	Always	Below 1 Ω
   2A-28 or D175-13 - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  11

1. Check vehicle type.

   Result

   Result	Proceed to
   w/ Smart Key System	A
   w/o Smart Key System	B

Result: 

B 

See step  14

Result: 

A 

See step  12

1. Inspect for a short in the circuit that is connected to the junction connector shown in the wiring diagram.
   1. Disconnect the junction connector.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      *a	Front view of wire harness connector (to Junction Connector)

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

      Standard Voltage

      Tester Connection	Switch Condition	Specified Condition
      D175-17 - Body ground	Ignition switch ON	4.5 to 14 V

Result: 

OK 

See step  14

Result: 

NG 

See step  13

1. Disconnect the D175 junction connector.
2. Disconnect the D89 power management control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D175-17 - D89-23 (SPD)	Always	Below 1 Ω
   D175-17 or D89-23 (SPD) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE POWER MANAGEMENT CONTROL ECU 

Refer to REMOVAL [11/2017 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Check vehicle type.

   Result

   Result	Proceed to
   w/ Rain Sensor	A
   w/o Rain Sensor	B

Result: 

B 

See step  17

Result: 

A 

See step  15

1. Inspect for a short in the circuit that is connected to the junction connector shown in the wiring diagram.
   1. Disconnect the junction connector.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      *a	Front view of wire harness connector (to Junction Connector)

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

      Standard Voltage

      Tester Connection	Switch Condition	Specified Condition
      D175-14 - Body ground	Ignition switch ON	4.5 to 14 V

Result: 

OK 

See step  17

Result: 

NG 

See step  16

1. Disconnect the D175 junction connector.
2. Disconnect the D78 windshield wiper relay assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D175-14 - D78-19 (SPD)	Always	Below 1 Ω
   D175-14 or D78-19 (SPD) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE WINDSHIELD WIPER RELAY ASSEMBLY 

Refer to REMOVAL [12/2015 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Check vehicle type.

   Result

   Result	Proceed to
   for Separate Type Amplifier System	A
   except Separate Type Amplifier System	B

Result: 

B 

See step  20

Result: 

A 

See step  18

1. Inspect for a short in the circuit that is connected to the junction connector shown in the wiring diagram.
   1. Disconnect the junction connector.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      *a	Front view of wire harness connector (to Junction Connector)

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

      Standard Voltage

      Tester Connection	Switch Condition	Specified Condition
      D175-16 - Body ground	Ignition switch ON	4.5 to 14 V

Result: 

OK 

See step  20

Result: 

NG 

See step  19

1. Disconnect the D175 junction connector.
2. Disconnect the L56 stereo component amplifier assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D175-16 - L56-11 (SPD)	Always	Below 1 Ω
   D175-16 or L56-11 (SPD) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY 

Refer to REMOVAL [12/2015 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Check vehicle type.

   Result

   Result	Proceed to
   w/ Safety Connect System	A
   w/o Safety Connect System	B

Result: 

B 

See step  23

Result: 

A 

See step  21

1. Inspect for a short in the circuit that is connected to the junction connector shown in the wiring diagram.
   1. Disconnect the junction connector.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      *a	Front view of wire harness connector (to Junction Connector)

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

      Standard Voltage

      Tester Connection	Switch Condition	Specified Condition
      D175-15 - Body ground	Ignition switch ON	4.5 to 14 V

Result: 

OK 

See step  23

Result: 

NG 

See step  22

1. Disconnect the D175 junction connector.
2. Disconnect the D73 telematics transceiver connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D175-15 - D73-10 (SPDP)	Always	Below 1 Ω
   D175-15 or D73-10 (SPDP) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE DCM (TELEMATICS TRANSCEIVER) 

Refer to REMOVAL [11/2017 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Check vehicle type.

   Result

   Result	Proceed to
   w/ Navigatiom System	A
   w/o Navigatiom System	B

Result: 

B 

See step  26

Result: 

A 

See step  24

1. Inspect for a short in the circuit that is connected to the junction connector shown in the wiring diagram.
   1. Disconnect the junction connector.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      *a	Front view of wire harness connector (to Junction Connector)

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

      Standard Voltage

      Tester Connection	Switch Condition	Specified Condition
      D175-18 - Body ground	Ignition switch ON	4.5 to 14 V

Result: 

OK 

See step  26

Result: 

NG 

See step  25

1. Disconnect the D175 junction connector.
2. Disconnect the D199 navigation ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D175-18 - D199-9 (SPD)	Always	Below 1 Ω
   D175-18 or D199-9 (SPD) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE NAVIGATION ECU. Refer to  REMOVAL [11/2017 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Inspect for a short in the circuit that is connected to the junction connector shown in the wiring diagram.
   1. Disconnect the junction connector.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      *a	Front view of wire harness connector (to Junction Connector)

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

      Standard Voltage

      Tester Connection	Switch Condition	Specified Condition
      D175-12 - Body ground	Ignition switch ON	4.5 to 14 V

Result: 

OK 

REPLACE JUNCTION CONNECTOR 

Result: 

NG 

See step  27

1. Disconnect the D175 junction connector.
2. Disconnect the D195 radio and display receiver assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D175-12 - D195-27 (SPD)	Always	Below 1 Ω
   D175-12 or D195-27 (SPD) - Body ground	Always	10 kΩ or higher

   RESULT
   
   

   Result	Proceed to
   NG	A
   OK (w/ Navigation System)	B
   OK (w/o Navigation System)	C

Result: 

A 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

B 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 

Refer to REMOVAL [11/2017 - ]

Result: 

C 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 

Refer to REMOVAL [11/2017 - ]