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CAN Communication System (Diagnostic Codes (U0100 - U1002)): Other Lexus GS IV

Communication Devices ~1670 words

PROCEDURE

  1. RECONFIRM DTC OUTPUT Reconfirm DTCs. HINT: If DTC U1002 is output from Gateway of the network gateway ECU, this indicates a sub bus 2 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 2. RESULT Result Proceed to DTC U1002 is not output from network gateway ECU. A DTC U1002 is output from network gateway ECU (Sub Bus 2). B B --> See step 4 A: Go to next step
  2. CHECK FOR OPEN IN CAN BUS WIRE (ABSORBER CONTROL ECU CAN BRANCH WIRE) Disconnect the cable from the negative (-) auxiliary battery terminal. Disconnect the absorber control ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance SUB BUS 2 Tester Connection Condition Specified Condition N105-7 (CANH) - N105-8 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 ohms TEXT IN ILLUSTRATION *a Rear view of wire harness connector (to Absorber Control ECU) NG --> REPAIR OR REPLACE ABSORBER CONTROL ECU CAN BRANCH WIRE OR CONNECTOR (CANH, CANL) OK: Go to next step
  3. CHECK HARNESS AND CONNECTOR (ABSORBER CONTROL ECU - BATTERY AND BODY GROUND) Connect the cable to the negative (-) auxiliary battery terminal. NOTE: When connecting the cable, some systems need to be initialized after the cable is reconnected. Refer to «INITIALIZATION [03/2012 - ]»(ref-600412-S41156157812014022400000) . Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition N105-3 (B) - Body ground Ppower switch on (IG) 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition N105-5 (GND) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *a Rear view of wire harness connector (to Absorber Control ECU) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 5
  4. GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC. Refer to «DTC U1002: Lost Communication with Gateway Module (Network Gateway ECU)»(ref-600619-S41869468502014022400000)
  5. REPLACE ABSORBER CONTROL ECU. Refer to «REMOVAL [03/2012 - ]»(ref-600637-S30781892722014022400000)
  1. RECONFIRM DTC OUTPUT Reconfirm DTCs. HINT: If DTC U1002 is output from Gateway of the main body ECU (multiplex network body ECU), this indicates a sub bus 1 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 1. RESULT Result Proceed to DTC U1002 is not output from main body ECU (multiplex network body ECU). A DTC U1002 is output from main body ECU (multiplex network body ECU). B B --> See step 4 A: Go to next step
  2. CHECK FOR OPEN IN CAN BUS WIRE (POSITION CONTROL ECU ASSEMBLY RH CAN BRANCH WIRE) Disconnect the cable from the negative (-) auxiliary battery terminal. Disconnect the position control ECU assembly RH connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition c2-8 (CANP) - c2-9 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 ohms TEXT IN ILLUSTRATION *a Rear view of wire harness connector (to Position Control ECU Assembly RH) NG --> REPAIR OR REPLACE POSITION CONTROL ECU ASSEMBLY RH CAN BRANCH WIRE OR CONNECTOR (CANP, CANN) OK: Go to next step
  3. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY RH - BATTERY AND BODY GROUND) Connect the cable to the negative (-) auxiliary battery terminal. NOTE: When connecting the cable, some systems need to be initialized after the cable is reconnected. Refer to «INITIALIZATION [03/2012 - ]»(ref-600412-S41156157812014022400000) . Disconnect the position control ECU assembly RH connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition c3-1 (+B2) - Body ground Always 11 to 14 V c3-2 (+B) - Body ground Always 11 to 14 V c2-18 (SYSB) - Body ground Always 11 to 14 V c2-7 (IG) - Body ground Power switch on (IG) 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition c2-2 (GND) - Body ground Always Below 1 ohms c2-1 (GND2) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *a Rear view of wire harness connector (to Position Control ECU Assembly RH) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 5
  4. GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC. Refer to «DTC U1002: Lost Communication with Gateway Module (Main Body ECU)»(ref-600675-S36874588612014022400000)
  5. REPLACE POSITION CONTROL ECU ASSEMBLY RH. Refer to «DISASSEMBLY [03/2012 - ]»(ref-600608-S13443618072014022400000)
  1. RECONFIRM DTC OUTPUT Reconfirm DTCs. HINT: If DTC U1002 is output from Gateway of the driving support ECU assembly, this indicates a sub bus 13 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 13. RESULT Result Proceed to DTC U1002 is not output from driving support ECU assembly. A DTC U1002 is output from driving support ECU assembly. B B --> See step 4 A: Go to next step
  2. CHECK FOR OPEN IN CAN BUS WIRE (MILLIMETER WAVE RADAR SENSOR ASSEMBLY CAN MAIN WIRE) Disconnect the cable from the negative (-) auxiliary battery terminal. Disconnect the millimeter wave radar sensor assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition B12-4 (CA1P) - B12-3 (CA1N) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 ohms TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Millimeter Wave Radar Sensor Assembly) NG --> REPAIR OR REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY CAN MAIN WIRE OR CONNECTOR (CA1P, CA1N) OK: Go to next step
  3. CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - BATTERY AND BODY GROUND) Connect the cable to the negative (-) auxiliary battery terminal. NOTE: When connecting the cable, some systems need to be initialized after the cable is reconnected. Refer to «INITIALIZATION [03/2012 - ]»(ref-600412-S41156157812014022400000) . Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition B12-5 (IGB) - Body ground Power switch on (IG) 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition B12-2 (SGND) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Millimeter Wave Radar Sensor Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 5
  4. GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC. Refer to «DTC U1002: Lost Communication with Gateway Module (Parking Assist Bus)»(ref-600619-S03403483752014022400000)
  5. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY. Refer to «REMOVAL [03/2012 - ]»(ref-600437-S01407174582014022400000)
  1. RECONFIRM DTC OUTPUT Reconfirm DTCs. HINT: If DTC U1002 is output from Gateway of the network gateway ECU, this indicates a sub bus 2 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 2. RESULT Result Proceed to DTC U1002 is not output from network gateway ECU. A DTC U1002 is output from network gateway ECU. B B --> See step 5 A: Go to next step
  2. RECONFIRM DTC OUTPUT Reconfirm DTCs. HINT: If DTC U1107-436 is output from Gateway of the power management control ECU, this indicates a sub bus 15 malfunction. Troubleshoot for DTC U1107-436 and check for malfunctions in sub bus 15. RESULT Result Proceed to DTC U1107-436 is not output from power management control ECU. A DTC U1107-436 is output from power management control ECU. B B --> See step 7 A: Go to next step
  3. CHECK FOR OPEN IN CAN BUS WIRE (POWER MANAGEMENT CONTROL ECU CAN MAIN OR BRANCH WIRE) Disconnect the cable from the negative (-) auxiliary battery terminal. Disconnect the power management control ECU connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance SUB BUS 2 Tester Connection Condition Specified Condition N91-35 (CA2H) - N91-34 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 ohms SUB BUS 15 Tester Connection Condition Specified Condition N92-31 (CA3P) - N92-30 (CA3N) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 ohms TEXT IN ILLUSTRATION *A Sub Bus 2 *B Sub Bus 15 *a Rear view of wire harness connector (to Power Management Control ECU) RESULT Result Proceed to OK A NG (Sub Bus 2) B NG (Sub Bus 15) C B --> REPAIR OR REPLACE POWER MANAGEMENT CONTROL ECU CAN BRANCH WIRE OR CONNECTOR (CA2H, CAN2L) C --> REPAIR OR REPLACE POWER MANAGEMENT CONTROL ECU CAN MAIN WIRE OR CONNECTOR (CA3P, CA3N) A: Go to next step
  4. CHECK HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND BODY GROUND) Connect the cable to the negative (-) auxiliary battery terminal. TEXT IN ILLUSTRATION *a Rear view of wire harness connector (to Power Management Control ECU) - - NOTE: When connecting the cable, some systems need to be initialized after the cable is reconnected. Refer to «INITIALIZATION [03/2012 - ]»(ref-600412-S41156157812014022400000) . Disconnect the power management control ECU connectors. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition N91-1 (AM22) - Body ground Always 11 to 14 V N92-7 (AM21) - Body ground Always 11 to 14 V A35-1 (+B2) - Body ground Power switch on (IG) 11 to 14 V A36-3 (+B1) - Body ground Power switch on (IG) 11 to 14 V A36-1 (IG2) - Body ground Power switch on (IG) 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition N91-5 (E01) - Body ground Always Below 1 ohms N91-6 (E1) - Body ground Always Below 1 ohms N92-5 (E02) - Body ground Always Below 1 ohms N92-4 (E12) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
  5. GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC. Refer to «DTC U1002: Lost Communication with Gateway Module (Network Gateway ECU)»(ref-600619-S41869468502014022400000)
  6. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to «REMOVAL [03/2012 - ]»(ref-600595-S22014970062014022400000)
  7. GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC. Refer to «DTC U1107-436: Lost Communication with Power Management Module»(ref-600675-S01591469592014022400000)

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