Multiplex Communication: Overview Toyota Prius II рестайлинг

DESCRIPTION

This DTC is detected when communication between the main body ECU and gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION - TROUBLE AREA

Scheme 81

Scheme 82

Scheme 83

1. INSPECT FUSE (DOME) Remove the DOME fuse from the engine room junction block and relay block. Measure the resistance of the fuse. Standard resistance: Below 1 ohms NG : REPLACE FUSE OK : GO TO NEXT STEP
2. CHECK WIRE HARNESS (DRIVER SIDE JUNCTION BLOCK - BATTERY AND BODY GROUND) Disconnect the 1A and 1E junction block connectors. Measure the resistance and voltage of the wire harness side connectors. Standard resistance TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition 1E-17 (GND) - Body ground Below 1 ohms Standard voltage TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition 1A-30 (ECUB) - Body ground 10 to 14 V NG : REPAIR OR REPLACE HARNESS AND CONNECTOR OK : GO TO NEXT STEP
3. CHECK COMMUNICATION LINE Disconnect the 1G junction block connector. Disconnect the T5, A8 and B5 ECU connectors. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition T5-17 (MPX1) - B5-15 (MPX2) Below 1 ohms A8-11 (MPX2+) - 1G-9 (MPX1) Below 1 ohms Result: RESULT Result Proceed to Both are OK A One is OK B Both are NG C B : REPLACE DRIVER SIDE JUNCTION BLOCK C : REPLACE DRIVER SIDE JUNCTION BLOCK AND REPAIR OR REPLACE HARNESS AND CONNECTOR A : REPLACE DRIVER SIDE JUNCTION BLOCK

This DTC is detected when communication between the certification ECU and gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION - TROUBLE AREA

Scheme 84

Scheme 85

Scheme 86

1. CHECK OPERATION With the key in your possession, push the lock button on the door outside handle (entry lock operation). Check that the key warning light illuminates or starts blinking. With the key in your possession, touch the inside of the door outside handle (entry unlock operation). Check that the key warning light illuminates or starts blinking. OK : Key warning light illuminates or starts blinking. OK : Go to step 3 NG : GO TO NEXT STEP
2. CHECK WIRE HARNESS (CERTIFICATION ECU - BODY GROUND) Disconnect the S11 ECU connector. Measure the resistance and voltage of the wire harness side connector. Standard resistance TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition S11-17 (E) - Body ground Below 1 ohms Standard voltage TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition S11-1 (+B1) - Body ground 10 to 14 V NG : REPAIR OR REPLACE HARNESS AND CONNECTOR OK : GO TO NEXT STEP
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the S11, T4 and T11 ECU connectors. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition S11-31 (MPX1) - T4-19 (MPX1) Below 1 ohms S11-32 (MPX2) - T11-6 (MPX1) Below 1 ohms Result: RESULT Result Proceed to Both are OK A One is OK B Both are NG C B : REPLACE CERTIFICATION ECU AND REPAIR OR REPLACE HARNESS AND CONNECTOR C : REPAIR OR REPLACE HARNESS AND CONNECTOR A : REPLACE CERTIFICATION ECU

This DTC is detected when communication between the power source control ECU and gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION - TROUBLE AREA

Scheme 87

Scheme 88

Scheme 89

1. CHECK OPERATION Without depressing the brake pedal, push the power switch repeatedly. Check that the power mode changes between OFF, ON (ACC) and ON (IG) alternately. OK : Key warning light illuminates or starts blinking according to power modes. OK : Go to step 3 NG : GO TO NEXT STEP
2. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND) Disconnect the P6 ECU connector. Measure the resistance and voltage of the wire harness side connector. Standard resistance TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition P6-6 (GND2) - Body ground Below 1 ohms Standard voltage TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition P6-33 (AM1) - Body ground 10 to 14 V P6-32 (AM2) - Body ground 10 to 14 V NG : REPAIR OR REPLACE HARNESS AND CONNECTOR OK : GO TO NEXT STEP
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the P6 and G1 ECU connectors. Disconnect the C10 meter connector. Measure the resistance between the wire harness side connectors. Standard resistance TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition P6-7 (MPX1) - C10-25 (MPX-) Below 1 ohms P6-24 (MPX2) - G1-3 (MPD1) Below 1 ohms Result: RESULT Result Proceed to Both are OK A One is OK B Both are NG C B : REPLACE POWER SOURCE CONTROL ECU AND REPAIR OR REPLACE HARNESS AND CONNECTOR C : REPAIR OR REPLACE HARNESS AND CONNECTOR A : REPLACE POWER SOURCE CONTROL ECU

The air conditioning (A/C) ECU, body ECU (built into driver side junction block), combination meter, certification ECU*, power source control ECU, tire pressure monitor ECU, transmission control ECU, transponder key ECU and gateway ECU are connected to the Body Electronics Area Network (BEAN). The gateway ECU monitors the BEAN. If there is a B+ or GND short in the BEAN, the gateway ECU sets the DTC and the related system(s) do not operate.

DTC DETECTION CONDITION - TROUBLE AREA

HINT

*: Equipped on smart key vehicles.

Scheme 90

Scheme 91

Scheme 92

Scheme 93

Scheme 94

Scheme 95

Scheme 96

Scheme 97

Scheme 98

Scheme 99

Scheme 100

Scheme 101

Scheme 102

Scheme 103

Scheme 104

Scheme 105

Scheme 106

Scheme 107

1. CHECK A/C ECU Turn the power switch OFF. Disconnect the A/C ECU connector. Connect the Techstream to the DLC3. Turn the power switch ON (IG). Clear and check DTCs. Result RESULT DTC Conclusion Proceed to B1214 or B1215 is present A/C ECU is OK A B1214 and B1215 are not present A/C ECU is malfunctioning B B : REPLACE A/C ECU A : GO TO NEXT STEP
2. CHECK TRANSMISSION CONTROL ECU Turn the power switch OFF. Connect the A/C ECU connector. Disconnect the transmission control ECU connector. Turn the power switch ON (IG). Clear and check DTCs. Result RESULT DTC Conclusion Proceed to B1214 or B1215 is present Transmission control ECU is OK A B1214 and B1215 are not present Transmission control ECU is malfunctioning B B : REPLACE TRANSMISSION CONTROL ECU A : GO TO NEXT STEP
3. CHECK WIRE HARNESS (TRANSMISSION CONTROL ECU - A/C ECU) Turn the power switch OFF. Disconnect the transmission control ECU connector and A/C ECU connector. Turn the power switch ON (IG). Clear and check DTCs. Result RESULT DTC Conclusion Proceed to B1214 or B1215 is present Wire harness is OK A B1214 and B1215 are not present Wire harness is short circuit B B : Go to step 8 A : GO TO NEXT STEP
4. CHECK POWER SOURCE CONTROL ECU Turn the power switch OFF. Connect the A/C ECU connector and transmission control ECU connector. Disconnect the power source control ECU connector. Turn the power switch ON (IG). Clear and check DTCs. Result RESULT DTC Conclusion Proceed to B1214 or B1215 is present Power source control ECU is OK A B1214 and B1215 are not present Power source control ECU is malfunctioning B B : REPLACE POWER SOURCE CONTROL ECU A : GO TO NEXT STEP
5. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - TRANSMISSION CONTROL ECU) Turn the power switch OFF. Disconnect the power source control ECU connector and transmission control ECU connector. Turn the power switch ON (IG). Clear and check DTCs. Result RESULT DTC Conclusion Proceed to B1214 or B1215 is present Wire harness is OK A B1214 and B1215 are not present Wire harness is short circuit B B : Go to step 12 A : GO TO NEXT STEP
6. CHECK WIRE HARNESS (GATEWAY ECU - POWER SOURCE CONTROL ECU) Turn the power switch OFF. Connect the transmission control ECU connector. Disconnect the power source control ECU connector and gateway ECU connector. Measure the resistance and voltage of the gateway ECU connector terminal. Standard resistance TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition G1-3 (MPD1) - Body ground 10 kohms or higher Standard voltage TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Condition Specified Condition G1-3 (MPD1) - Body ground Power switch ON (IG) Below 1 V NG : REPAIR OR REPLACE HARNESS AND CONNECTOR OK : GO TO NEXT STEP
7. CHECK WIRE HARNESS (GATEWAY ECU - A/C ECU) Turn the power switch OFF. Connect the power source control ECU connector. Disconnect the A/C ECU connector and gateway ECU connector. Measure the resistance and voltage of the gateway ECU connector terminal. Standard resistance TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition G1-12 (MPD2) - Body ground 10 kohms or higher Standard voltage TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Condition Specified Condition G1-12 (MPD2) - Body ground Power switch ON (IG) Below 1 V NG : REPAIR OR REPLACE HARNESS AND CONNECTOR OK : REPLACE GATEWAY ECU
8. CHECK DRIVER SIDE JUNCTION BLOCK Turn the power switch OFF. Connect the A/C ECU connector and transmission control ECU connector. Disconnect the 1G driver side junction block connector and B5 main body ECU connector. Turn the power switch ON (IG). Clear and check DTCs. Result RESULT DTC Conclusion Proceed to B1214 or B1215 is present Driver side junction block is OK A B1214 and B1215 are not present Driver side junction block is malfunctioning B B : REPLACE DRIVER SIDE JUNCTION BLOCK A : GO TO NEXT STEP
9. CHECK WIRE HARNESS (DRIVER SIDE JUNCTION BLOCK - A/C ECU) Turn the power switch OFF. Connect the B5 ECU connector. Disconnect the 1G driver side junction block connector and A/C ECU connector. Turn the power switch ON (IG). Clear and check DTCs. Result RESULT DTC Conclusion Proceed to B1214 or B1215 is present Wire harness is OK A B1214 and B1215 are not present Wire harness is short circuit B B : REPAIR OR REPLACE HARNESS AND CONNECTOR A : GO TO NEXT STEP
10. CHECK TRANSPONDER KEY ECU Turn the power switch OFF. Connect the driver side junction block connector and A/C ECU connector. Disconnect the transponder key ECU connector. Turn the power switch ON (IG). Clear and check DTCs. Result RESULT DTC Conclusion Proceed to B1214 or B1215 is present Transponder key ECU is OK A B1214 and B1215 are not present Transponder key ECU is malfunctioning B B : REPLACE TRANSPONDER KEY ECU A : GO TO NEXT STEP
11. CHECK WIRE HARNESS (TRANSPONDER KEY ECU - DRIVER SIDE JUNCTION BLOCK) Turn the power switch OFF. Disconnect the transponder key ECU connector and B5 ECU connector. Turn the power switch ON (IG). Clear and check DTCs. Result RESULT DTC Conclusion Proceed to B1214 or B1215 is present Wire harness is OK A B1214 and B1215 are not present Wire harness is short circuit B B : REPAIR OR REPLACE HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - DRIVER SIDE JUNCTION BLOCK) A : REPAIR OR REPLACE HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSMISSION CONTROL ECU)
12. CHECK COMBINATION METER Turn the power switch OFF. Connect the power source control ECU connector and transmission control ECU connector. Disconnect the C10 meter connector. Turn the ignition switch ON (IG). Clear and check DTCs. Result RESULT DTC Conclusion Proceed to B1214 or B1215 is present Combination meter is OK A B1214 and B1215 are not present Combination meter is malfunctioning B B : REPLACE COMBINATION METER A : GO TO NEXT STEP
13. CHECK WIRE HARNESS (COMBINATION METER - POWER SOURCE CONTROL ECU) Turn the power switch OFF. Disconnect the C10 combination meter and power source control ECU connector. Turn the power switch ON (IG). Clear and check DTCs. Result RESULT DTC Conclusion Proceed to B1214 or B1215 is present Wire harness is OK A B1214 and B1215 are not present Wire harness is short circuit B B : REPAIR OR REPLACE HARNESS AND CONNECTOR A : GO TO NEXT STEP
14. CHECK TIRE PRESSURE WARNING ECU Turn the power switch OFF. Connect the C10 meter connector and power source control ECU connector. Disconnect the tire pressure monitor ECU connector. Turn the power switch ON (IG). Clear and check DTCs. Result RESULT DTC Conclusion Proceed to B1214 or B1215 is present Tire pressure monitor ECU is OK A B1214 and B1215 are not present Tire pressure monitor ECU is malfunctioning B B : REPLACE TIRE PRESSURE WARNING ECU A : GO TO NEXT STEP
15. CHECK WIRE HARNESS (TIRE PRESSURE WARNING ECU - COMBINATION METER) Turn the power switch OFF. Disconnect the tire pressure monitor ECU connector and C10 meter connector. Turn the power switch ON (IG). Clear and check DTCs. Result RESULT DTC Conclusion Proceed to B1214 or B1215 is present Wire harness is OK A B1214 and B1215 are not present Wire harness is short circuit B B : REPAIR OR REPLACE HARNESS AND CONNECTOR A : GO TO NEXT STEP
16. CONFIRM EQUIPMENT Equipment EQUIPMENT Equipment Proceed to With smart key system A Without smart key system B B : REPAIR OR REPLACE HARNESS AND CONNECTOR (TIRE PRESSURE MONITOR ECU - TRANSMISSION CONTROL ECU) A : GO TO NEXT STEP
17. CHECK CERTIFICATION ECU Turn the power switch OFF. Connect the C10 meter connector and tire pressure monitor ECU connector. Disconnect the certification ECU connector. Turn the power switch ON (IG). Clear and check DTCs. Result RESULT DTC Conclusion Proceed to B1214 or B1215 is present Certification ECU is OK A B1214 and B1215 are not present Certification ECU is malfunctioning B B : REPLACE CERTIFICATION ECU A : GO TO NEXT STEP
18. CHECK WIRE HARNESS (CERTIFICATION ECU - TIRE PRESSURE MONITOR ECU) Turn the power switch OFF. Disconnect the certification ECU connector and tire pressure monitor ECU connector. Turn the power switch ON (IG). Clear and check DTCs. Result RESULT DTC Conclusion Proceed to B1214 or B1215 is present Wire harness is OK A B1214 and B1215 are not present Wire harness is short circuit B B : REPAIR OR REPLACE HARNESS AND CONNECTOR (CERTIFICATION ECU - TIRE PRESSURE MONITOR ECU) A : REPAIR OR REPLACE HARNESS AND CONNECTOR (CERTIFICATION ECU - TRANSMISSION CONTROL ECU)

This DTC is detected when the communication between the tire pressure warning ECU and gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION - TROUBLE AREA

Scheme 108

Scheme 109

Scheme 110

Scheme 111

1. INSPECT FUSE (ECU-IG) Remove the ECU-IG fuse from the driver side junction block. Measure the resistance of the fuse. Standard resistance: Below 1 ohms NG : REPLACE FUSE OK : GO TO NEXT STEP
2. CHECK WIRE HARNESS (TIRE PRESSURE WARNING ECU - BATTERY AND BODY GROUND) Disconnect the T11 ECU connector. Turn the power switch ON (IG). Measure the voltage and resistance of the wire harness side connector. Standard voltage TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Condition Specified Condition T11-1 (IG) - Body ground Power switch ON (IG) 10 to 14 V Standard resistance TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition T11-7 (GND) - Body ground Below 1 ohms NG : REPAIR OR REPLACE HARNESS AND CONNECTOR OK : GO TO NEXT STEP
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the T11, S11*1 and T4*2 ECU connectors. Disconnect the C10 meter connector. Measure the resistance of the wire harness side connector. Standard resistance TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition T11-6 (MPX1) - S11-32 (MPX2)*1 Below 1 ohms T11-6 (MPX1) - T4-19 (MPX1)*2 Below 1 ohms T11-12 (MPX2) - C10-24 (MPX+) Below 1 ohms HINT: *1: w/ Smart key system (for door lock) *2: w/o Smart key system (for door lock) Result: RESULT Result Proceed to Both are OK A One is OK B Both are NG C B : REPLACE TIRE PRESSURE WARNING ECU AND REPAIR OR REPLACE HARNESS AND CONNECTOR C : REPAIR OR REPLACE HARNESS AND CONNECTOR A : REPLACE TIRE PRESSURE WARNING ECU

This DTC is detected when communication is impossible between the multi-display and gateway ECU.

DTC DETECTION CONDITION - TROUBLE AREA

Scheme 112

Scheme 113

1. CHECK OPERATION Check that the radio and player switch can operate normally. OK : Radio and player switch can operate normally. NG : GO TO AUDIO SYSTEM OK : GO TO NEXT STEP
2. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the G1 ECU connector. Disconnect the M13*1 or M14*2 display connector. Measure the resistance between the wire harness side connectors. Standard resistance TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition M13-4 (TX1+)*1 - G1-6 (GTX+) Below 1 ohms M13-4 (TX1+)*1 - G1-6 (GTX+) Below 1 ohms M14-5 (TX1-)*2 - G1-21 (GTX-) Below 1 ohms M14-5 (TX1-)*2 - G1-21 (GTX-) Below 1 ohms HINT: *1: w/ Television camera *2: w/o Television camera NG : REPAIR OR REPLACE HARNESS AND CONNECTOR OK : REPLACE MULTI-DISPLAY

This DTC is detected when communication between the transmission control ECU and gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION - TROUBLE AREA

Scheme 114

Scheme 115

Scheme 116

1. INSPECT FUSE (HEV) Remove the HEV fuse from the engine room junction block. Measure the resistance. Standard resistance: Below 1 ohms NG : REPLACE FUSE OK : GO TO NEXT STEP
2. CHECK WIRE HARNESS (TRANSMISSION CONTROL ECU - BODY GROUND) Disconnect the T4 ECU connector. Measure the resistance and voltage between the wire harness side connector. Standard resistance TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition T4-15 (E1) - Body ground Below 1 ohms Standard voltage TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Condition Specified Condition T4-1 (+B) - Body ground Power switch ON (IG) 10 to 14 V NG : REPAIR OR REPLACE HARNESS AND CONNECTOR OK : GO TO NEXT STEP
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the T4, T5 and S11*1 or T11*2 ECU connectors. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition T4-18 (MPX2) - T5-16 (MPX2) Below 1 ohms T4-19 (MPX1) - S11-31 (MPX1)*1 Below 1 ohms T4-19 (MPX1) - T11-6 (MPX1)*2 Below 1 ohms HINT: *1: w/ Smart key system (for door lock) *2: w/o Smart key system (for door lock) Result: RESULT Result Proceed to Both are OK A One is OK B Both are NG C B : REPLACE TRANSMISSION CONTROL ECU AND REPAIR OR REPLACE HARNESS AND CONNECTOR C : REPAIR OR REPLACE HARNESS AND CONNECTOR A : REPLACE TRANSMISSION CONTROL ECU

This DTC is detected when communication between the A/C ECU and gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION - TROUBLE AREA

Scheme 117

Scheme 118

Scheme 119

1. CHECK OPERATION Check that the A/C switch can operate the air conditioner normally. OK : A/C switch can operate the air conditioner normally. OK : Go to step 3 NG : GO TO NEXT STEP
2. CHECK WIRE HARNESS (A/C ECU - BODY GROUND) Disconnect the A8 ECU connector. Measure the resistance and voltage of the wire harness side connector. Standard resistance TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition A8-1 (GND) - Body ground Below 1 ohms Standard voltage TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition A8-6 (+B) - Body ground 10 to 14 V NG : REPAIR OR REPLACE HARNESS AND CONNECTOR OK : GO TO NEXT STEP
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the A8 and G1 ECU connectors. Disconnect the 1G junction block connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition A8-3 (MPX+) - G1-12 (MPD2) Below 1 ohms A8-11 (MPX2+) - 1G-9 (MPX1) Below 1 ohms Result: RESULT Result Proceed to Both are OK A One is OK B Both are NG C B : REPLACE A/C ECU AND REPAIR OR REPLACE HARNESS AND CONNECTOR C : REPAIR OR REPLACE HARNESS AND CONNECTOR A : REPLACE A/C ECU

This DTC is detected when communication between the combination meter and gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION - TROUBLE AREA

Scheme 120

Scheme 121

Scheme 122

1. CHECK OPERATION Check that the indicator (READY) on the combination meter illuminates when the hybrid vehicle control system is operating (power switch ON (READY)). OK : Indicator can operate properly. OK : Go to step 3 NG : GO TO NEXT STEP
2. CHECK WIRE HARNESS (COMBINATION METER - BODY GROUND) Disconnect the C10 meter connector. Measure the resistance and voltage of the wire harness side connector. Standard resistance TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition C10-14 - Body ground Below 1 ohms Standard voltage TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition C10-21 - Body ground 10 to 14 V NG : REPAIR OR REPLACE HARNESS AND CONNECTOR OK : GO TO NEXT STEP
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the C10 meter connector. Disconnect the P6 and T11 ECU connectors. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition C10-24 (MPX+) - T11-12 (MPX2) Below 1 ohms C10-25 (MPX-) - P6-7 (MPX1) Below 1 ohms Result: RESULT Result Proceed to Both are OK A One is OK B Both are NG C B : REPLACE COMBINATION METER AND REPAIR OR REPLACE HARNESS AND CONNECTOR C : REPAIR OR REPLACE HARNESS AND CONNECTOR A : REPLACE COMBINATION METER

This DTC is detected when communication between the transponder key ECU and gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION - TROUBLE AREA

Scheme 123

Scheme 124

Scheme 125

1. INSPECT FUSE (IGN) Remove the IGN fuse from the driver side junction block. Measure the resistance of the fuse. Standard resistance: Below 1 ohms NG : REPLACE FUSE OK : GO TO NEXT STEP
2. CHECK WIRE HARNESS (TRANSPONDER KEY ECU - BODY GROUND) Disconnect the T5 ECU connector. Measure the resistance and voltage of the wire harness side connectors. Standard resistance TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition T5-22 (GND) - Body ground Below 1 ohms Standard voltage TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Condition Specified Condition T5-4 (IG) - Body ground Power switch ON (IG) 10 to 14 V NG : REPAIR OR REPLACE HARNESS AND CONNECTOR OK : GO TO NEXT STEP
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the T4, T5 and B5 ECU connectors. Measure the resistance of the wire harness side connectors. Standard resistance RESULT Tester Connection Specified Condition T5-17 (MPX1) - B5-15 (MPX2) Below 1 ohms T5-16 (MPX2) - T4-18 (MPX2) Below 1 ohms Result: RESULT Result Proceed to Both are OK A One is OK B Both are NG C B : REPLACE TRANSPONDER KEY ECU AND REPAIR OR REPLACE HARNESS AND CONNECTOR C : REPAIR OR REPLACE HARNESS AND CONNECTOR A : REPLACE TRANSPONDER KEY ECU