DESCRIPTION
There may be a short circuit between one of the CAN bus lines and GND when there is no resistance between terminal 15 (CA5H) of the network gateway ECU and terminal 4 (CG) of the DLC3, or terminal 16 (CA5L) of the network gateway ECU and terminal 4 (CG) of the DLC3.
Symptom | Trouble Area |
---|---|
No resistance exists between terminal 15 (CA5H) of the network gateway ECU and terminal 4 (CG) of the DLC3, or terminal 16 (CA5L) of the network gateway ECU and terminal 4 (CG) of the DLC3. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
Click here
Click here
Click here
Click here
HINT:
PROCEDURE
1. | CHECK FOR SHORT TO GND IN CAN BUS LINE (NETWORK GATEWAY ECU) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the J75 network gateway ECU connector.
*A | for DLC3 Connector Type A | *B | for DLC3 Connector Type B |
*1 | DLC3 | - | - |
*a | Front view of wire harness connector (to Network Gateway ECU) | - | - |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for DLC3 Connector Type A Tester Connection | Condition | Specified Condition |
---|---|---|
J75-15 (CA5H) - J12-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher |
J75-16 (CA5L) - J12-4 (CG) |
Tester Connection | Condition | Specified Condition |
---|---|---|
J75-15 (CA5H) - J141-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher |
J75-16 (CA5L) - J141-4 (CG) |
OK | ![]() | REPLACE NETWORK GATEWAY ECU |
|
2. | CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 5 CAN JUNCTION CONNECTOR) |
(a) Disconnect the J97 No. 5 CAN junction connector.
*A | for DLC3 Connector Type A | *B | for DLC3 Connector Type B |
*1 | DLC3 | - | - |
*a | Front view of wire harness connector (to No. 5 CAN Junction Connector) | *b | to Network Gateway ECU |
*c | to Combination Meter Mirror ECU (Headup Display) (w/ Headup Display System) | *d | to Headlight ECU Sub-assembly LH (w/ Automatic Headlight Beam Level Control System) |
*e | to Main Body ECU (Multiplex Network Body ECU) | *f | to Air Conditioning Amplifier Assembly |
*g | to Combination Meter Assembly | *h | to Certification ECU (Smart Key ECU Assembly) |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for DLC3 Connector Type A Tester Connection | Condition | Specified Condition | Connected to |
---|---|---|---|
*1: w/ Headup Display System
*2: w/ Automatic Headlight Beam Level Control System | |||
J97-1 (CANH) - J12-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher | Network gateway ECU |
J97-12 (CANL) - J12-4 (CG) | |||
J97-2 (CANH) - J12-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher | Combination meter mirror ECU (headup display)*1 |
J97-13 (CANL) - J12-4 (CG) | |||
J97-3 (CANH) - J12-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher | Headlight ECU sub-assembly LH*2 |
J97-14 (CANL) - J12-4 (CG) | |||
J97-4 (CANH) - J12-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher | Main body ECU (multiplex network body ECU) |
J97-15 (CANL) - J12-4 (CG) | |||
J97-5 (CANH) - J12-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher | Air conditioning amplifier assembly |
J97-16 (CANL) - J12-4 (CG) | |||
J97-6 (CANH) - J12-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher | Combination meter assembly |
J97-17 (CANL) - J12-4 (CG) | |||
J97-7 (CANH) - J12-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher | Certification ECU (smart key ECU assembly) |
J97-18 (CANL) - J12-4 (CG) |
Tester Connection | Condition | Specified Condition | Connected to |
---|---|---|---|
*1: w/ Headup Display System
*2: w/ Automatic Headlight Beam Level Control System | |||
J97-1 (CANH) - J141-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher | Network gateway ECU |
J97-12 (CANL) - J141-4 (CG) | |||
J97-2 (CANH) - J141-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher | Combination meter mirror ECU (headup display)*1 |
J97-13 (CANL) - J141-4 (CG) | |||
J97-3 (CANH) - J141-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher | Headlight ECU sub-assembly LH*2 |
J97-14 (CANL) - J141-4 (CG) | |||
J97-4 (CANH) - J141-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher | Main body ECU (multiplex network body ECU) |
J97-15 (CANL) - J141-4 (CG) | |||
J97-5 (CANH) - J141-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher | Air conditioning amplifier assembly |
J97-16 (CANL) - J141-4 (CG) | |||
J97-6 (CANH) - J141-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher | Combination meter assembly |
J97-17 (CANL) - J141-4 (CG) | |||
J97-7 (CANH) - J141-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher | Certification ECU (smart key ECU assembly) |
J97-18 (CANL) - J141-4 (CG) |
Result | Proceed to |
---|---|
OK | A |
NG (Network gateway ECU bus line) | B |
NG (ECU or sensor bus line) | C |
A | ![]() | REPLACE NO. 5 CAN JUNCTION CONNECTOR |
B | ![]() | REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NETWORK GATEWAY ECU - NO. 5 CAN JUNCTION CONNECTOR) |
|
3. | CHECK FOR SHORT TO GND IN CAN BUS LINE (ECU, SENSOR) |
(a) Reconnect all wire harness connectors.
(b) Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the bus line shorted to GND is connected.
Click here
(c) Measure the resistance according to the value(s) in the table below.
*A | for DLC3 Connector Type A | *B | for DLC3 Connector Type B |
*1 | DLC3 | - | - |
*a | Component with harness connected (Network Gateway ECU) | - | - |
Standard Resistance:
for DLC3 Connector Type A Tester Connection | Condition | Specified Condition |
---|---|---|
J75-15 (CA5H) - J12-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher |
J75-16 (CA5L) - J12-4 (CG) |
Tester Connection | Condition | Specified Condition |
---|---|---|
J75-15 (CA5H) - J141-4 (CG) | Cable disconnected from negative (-) battery terminal | 200 Ω or higher |
J75-16 (CA5L) - J141-4 (CG) |
HINT:
If the resistance changes to 200 Ω or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
OK | ![]() | REPLACE CORRESPONDING ECU OR SENSOR |
NG | ![]() | REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR CAN BUS LINE OR CONNECTOR |
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Panoramic Moon Roof System: Terminals Of Ecu
TERMINALS OF ECU CHECK SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY) (a) Disconnect the U2 sliding roof ECU (sliding roof drive gear assembly) connector. (b) Measure the resistance and voltage according to the value(s) in the table below. HINT: Measure the values on the wire harness side with ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Panoramic View Monitor System: Side Camera RH Internal Circuit (C2A62)
DESCRIPTION This DTC is stored when the parking assist ECU detects a signal indicating a malfunction in the side television camera assembly RH via CAN communication. DTC No. Detection Item DTC Detection Condition Trouble Area C2A62 Side Camera RH Internal Circuit A signal indicating ...