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Home >> Lexus >> 2009 >> LS 460 AWD V8-4.6L (1UR-FSE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> U Code Charts >> U1002 >> Part 2

Part 2








CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U1002: Lost Communication with Gateway Module

DTC U1002 - Lost Communication with Gateway Module (Continued)

48. CHECK FOR SHORT IN CAN BUS WIRES (NO. 10 JUNCTION CONNECTOR SIDE)




(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- CONNECT CONNECTOR
OK -- Continue to next step.

49. CHECK FOR SHORT IN CAN BUS WIRES (NO. 10 JUNCTION CONNECTOR - COMBINATION SWITCH)




(a) Measure the resistance according to the value(s) in the table below.






NG -- CONNECT CONNECTOR
OK -- Continue to next step.

50. CHECK FOR SHORT IN CAN BUS WIRES (NO. 10 JUNCTION CONNECTOR - MAIN BODY ECU)




(a) Measure the resistance according to the value(s) in the table below.






NG -- CONNECT CONNECTOR
OK -- Continue to next step.

51. CHECK FOR SHORT IN CAN BUS WIRE (NO. 10 JUNCTION CONNECTOR - MULTIPLEX TILT AND TELESCOPIC ECU)




(a) Measure the resistance according to the value(s) in the table below.






NG -- CONNECT CONNECTOR
OK -- Continue to next step.

52. CHECK FOR SHORT IN CAN BUS WIRES (NO. 10 JUNCTION CONNECTOR - NO. 1 METER ECU)




(a) Measure the resistance according to the value(s) in the table below.






NG -- CONNECT CONNECTOR
OK -- Continue to next step.

53. CHECK FOR SHORT IN CAN BUS WIRES (NO. 10 JUNCTION CONNECTOR - CERTIFICATION ECU)




(a) Measure the resistance according to the value(s) in the table below.






NG -- CONNECT CONNECTOR
OK -- Continue to next step.

54. CHECK FOR SHORT IN CAN BUS WIRES (NO. 10 JUNCTION CONNECTOR - OUTER MIRROR SWITCH)




(a) Measure the resistance according to the value(s) in the table below.






NG -- CONNECT CONNECTOR
OK -- Continue to next step.

55. CHECK FOR SHORT IN CAN BUS WIRES (NO. 10 JUNCTION CONNECTOR - STEERING PAD ECU)




(a) Measure the resistance according to the value(s) in the table below.






NG -- CONNECT CONNECTOR
OK -- REPAIR OR REPLACE NO. 10 JUNCTION CONNECTOR
56. CONNECT CONNECTOR
(a) Reconnect the L95 No. 10 junction connector connector.
NEXT -- Continue to next step.

57. CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION SWITCH)




(a) Disconnect the L25 combination switch connector.
(b) Measure the resistance according to the value(s) in the table below.

Result





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO COMBINATION SWITCH (CANP, CANN)
OK -- REPLACE COMBINATION SWITCH ASSEMBLY (WINDSHIELD WIPER SWITCH ASSEMBLY)
58. CONNECT CONNECTOR
(a) Reconnect the L95 No. 10 junction connector connector.
NEXT -- Continue to next step.

59. CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU)




(a) Disconnect the L11 main body ECU connector.
(b) Measure the resistance according to the value(s) in the table below.

Result





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO MAIN BODY ECU (CANP, CANN)
OK -- REPLACE MAIN BODY ECU
60. CONNECT CONNECTOR
(a) Reconnect the L95 No. 10 junction connector connector.
NEXT -- Continue to next step.

61. CHECK FOR SHORT IN CAN BUS WIRES (MULTIPLEX TILT AND TELESCOPIC ECU)




(a) Disconnect the L34 multiplex tilt and telescopic ECU connector.
(b) Measure the resistance according to the value(s) in the table below.

Result





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO MULTIPLEX TILT AND TELESCOPIC ECU (CANP, CANN)
OK -- REPLACE MULTIPLEX TILT AND TELESCOPIC ECU
62. CONNECT CONNECTOR
(a) Reconnect the L95 No. 10 junction connector connector.
NEXT -- Continue to next step.

63. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 METER ECU)




(a) Disconnect the L10 No. 1 meter ECU connector.
(b) Measure the resistance according to the value(s) in the table below.

Result





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO NO. 1 METER ECU (CANP, CANN)
OK -- REPLACE COMBINATION METER ASSEMBLY (NO. 1 METER ECU SUB-ASSEMBLY)
64. CONNECT CONNECTOR
(a) Reconnect the L95 No. 10 junction connector connector.
NEXT -- Continue to next step.

65. CHECK FOR SHORT IN CAN BUS WIRES (CERTIFICATION ECU)




(a) Disconnect the L15 certification ECU connector.
(b) Measure the resistance according to the value(s) in the table below.

Result





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO CERTIFICATION ECU (CANP, CANN)
OK -- REPLACE CERTIFICATION ECU
66. CONNECT CONNECTOR
(a) Reconnect the L95 No. 10 junction connector connector.
NEXT -- Continue to next step.

67. CHECK FOR SHORT IN CAN BUS WIRES (OUTER MIRROR SWITCH)




(a) Disconnect the L6 outer mirror switch connector.
(b) Measure the resistance according to the value(s) in the table below.

Result





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO OUTER MIRROR SWITCH (CANP, CANN)
OK -- REPLACE OUTER MIRROR SWITCH
68. CONNECT CONNECTOR
(a) Reconnect the L95 No. 10 junction connector connector.
NEXT -- Continue to next step.

69. CHECK FOR SHORT IN CAN BUS WIRES (STEERING PAD ECU)




(a) Disconnect the L24 spiral cable connector.
(b) Measure the resistance according to the value(s) in the table below.

Result





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO STEERING PAD ECU (CANP, CANN)
OK -- Continue to next step.

70. INSPECT SPIRAL CABLE SUB-ASSEMBLY




(a) Disconnect the L24 and z7 cable connectors.
(b) Set the spiral cable to the center position Installation.
(c) Measure the resistance between each terminal of the spiral cable according to the table below.
(d) After setting the spiral cable to the center position, rotate the spiral cable 2.5 times clockwise, and measure the resistance as shown. Then rotate the spiral cable 5 times counterclockwise, and measure the resistance as shown.
Standard resistance:





(e) After setting the spiral cable to the center position, rotate the spiral cable 2.5 times clockwise, and measure the resistance as shown. Then rotate the spiral cable 5 times counterclockwise, and measure the resistance as shown.
Standard resistance:





NOTE:
As the spiral cable may break, do not rotate the spiral cable more than the specified amount.

NG -- REPLACE SPIRAL CABLE SUB-ASSEMBLY
OK -- REPLACE STEERING PAD ECU
71. CONNECT CONNECTOR
(a) Reconnect the L95 No. 10 junction connector connector.
NEXT -- Continue to next step.

72. CHECK FOR SHORT IN CAN BUS WIRES (NO. 10 JUNCTION CONNECTOR - NO. 9 JUNCTION CONNECTOR)




(a) Disconnect the R48 No. 9 junction connector connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 10 JUNCTION CONNECTOR - NO. 9 JUNCTION CONNECTOR)
OK -- Continue to next step.

73. CHECK FOR SHORT IN CAN BUS WIRES (NO. 9 JUNCTION CONNECTOR SIDE)




(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- CONNECT CONNECTOR
OK -- Continue to next step.

74. CHECK FOR SHORT IN CAN BUS WIRES (NO. 9 JUNCTION CONNECTOR - FRONT MULTIPLEX NETWORK DOOR ECU RH)




(a) Measure the resistance according to the value(s) in the table below.






NG -- CONNECT CONNECTOR
OK -- Continue to next step.

75. CHECK FOR SHORT IN CAN BUS WIRES (NO. 9 JUNCTION CONNECTOR - BUS BUFFER ECU)
NOTE:
For vehicles without LEXUS link system, go to "CHECK FOR SHORT IN CAN BUS WIRES (NO. 9 JUNCTION CONNECTOR - REAR MULTIPLEX NETWORK DOOR ECU RH).




(a) Measure the resistance according to the value(s) in the table below.






NG -- CONNECT CONNECTOR
OK -- Continue to next step.

76. CHECK FOR SHORT IN CAN BUS WIRES (NO. 9 JUNCTION CONNECTOR - REAR MULTIPLEX NETWORK DOOR ECU RH)




(a) Measure the resistance according to the value(s) in the table below.






NG -- CONNECT CONNECTOR
OK -- Continue to next step.

77. CHECK FOR SHORT IN CAN BUS WIRES (NO. 9 JUNCTION CONNECTOR - TIRE PRESSURE WARNING ECU)




(a) Measure the resistance according to the value(s) in the table below.






NG -- CONNECT CONNECTOR
OK -- REPAIR OR REPLACE NO. 9 JUNCTION CONNECTOR
78. CONNECT CONNECTOR
(a) Reconnect the R48 No. 9 junction connector connector.
NEXT -- Continue to next step.

79. CHECK FOR SHORT IN CAN BUS WIRES (FRONT MULTIPLEX NETWORK DOOR ECU RH)




(a) Disconnect the N1 front multiplex network door ECU RH connector.
(b) Measure the resistance according to the value(s) in the table below.

Result





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO FRONT MULTIPLEX NETWORK DOOR ECU RH (CANP, CANN)
OK -- REPLACE FRONT MULTIPLEX NETWORK DOOR ECU RH
80. CONNECT CONNECTOR
(a) Reconnect the R48 No. 9 junction connector connector.
NEXT -- Continue to next step.

81. CHECK FOR SHORT IN CAN BUS WIRES (BUS BUFFER ECU)




(a) Disconnect the L93 bus buffer ECU connector.
(b) Measure the resistance according to the value(s) in the table below.

Result





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO BUS BUFFER ECU (CAN+, CAN-)
OK -- REPLACE BUS BUFFER ECU
82. CONNECT CONNECTOR
(a) Reconnect the R48 No. 9 junction connector connector.
NEXT -- Continue to next step.

83. CHECK SHORT IN CAN BUS WIRES (REAR MULTIPLEX NETWORK DOOR ECU RH)




(a) Disconnect the O3 rear multiplex network door ECU RH connector.
(b) Measure the resistance according to the value(s) in the table below.

Result





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO REAR MULTIPLEX NETWORK DOOR ECU RH (CANP, CANN)
OK -- REPLACE REAR MULTIPLEX NETWORK DOOR ECU RH
84. CONNECT CONNECTOR
(a) Reconnect the R48 No. 9 junction connector connector.
NEXT -- Continue to next step.

85. CHECK FOR SHORT IN CAN BUS WIRES (TIRE PRESSURE WARNING ECU)




(a) Disconnect the L89 tire pressure warning ECU connector.
(b) Measure the resistance according to the value(s) in the table below.

Result





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO TIRE PRESSURE WARNING ECU (CANP, CANN)
OK -- REPLACE TIRE PRESSURE WARNING ECU
86. CONNECT CONNECTOR
(a) Reconnect the R48 No. 9 junction connector connector.
NEXT -- Continue to next step.

87. CHECK FOR SHORT IN CAN BUS WIRES (NO. 9 JUNCTION CONNECTOR - NO. 8 JUNCTION CONNECTOR)




(a) Disconnect the R57 No. 8 junction connector connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 9 JUNCTION CONNECTOR - NO. 8 JUNCTION CONNECTOR)
OK -- Continue to next step.

88. CHECK FOR SHORT IN CAN BUS WIRES (NO. 8 JUNCTION CONNECTOR - FRONT POWER SEAT ECU SWITCH RH)
NOTE:
For vehicles without rear power seat control system, go to "CHECK FOR SHORT IN CAN BUS WIRES (NO. 8 JUNCTION CONNECTOR - FRONT CONTROLLER)".




(a) Measure the resistance according to the value(s) in the table below.






NG -- CONNECT CONNECTOR
OK -- Continue to next step.

89. CHECK FOR SHORT IN CAN BUS WIRES (NO. 8 JUNCTION CONNECTOR - FRONT CONTROLLER)




(a) Measure the resistance according to the value(s) in the table below.






NG -- CONNECT CONNECTOR
OK -- REPAIR OR REPLACE NO. 8 JUNCTION CONNECTOR
90. CONNECT CONNECTOR
(a) Reconnect the R57 No. 8 junction connector connector.
NEXT -- Continue to next step.

91. CHECK FOR SHORT IN CAN BUS WIRES (FRONT POWER SEAT ECU AND SWITCH RH)




(a) Disconnect the e20 front power seat ECU and switch RH connector.
(b) Measure the resistance according to the value(s) in the table below.

Result





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO FRONT POWER SEAT ECU AND SWITCH RH (CANP, CANN)
OK -- REPLACE FRONT POWER SEAT ECU AND SWITCH RH
92. CONNECT CONNECTOR
(a) Reconnect the R57 No. 8 junction connector connector.
NEXT -- Continue to next step.

93. CHECK FOR SHORT IN CAN BUS WIRES (FRONT CONTROLLER)




(a) Disconnect the A50 front controller connector.
(b) Measure the resistance according to the value(s) in the table below.

Result





NG -- REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO FRONT CONTROLLER (NO. 8 JUNCTION CONNECTOR - FRONT CONTROLLER)
OK -- REPLACE FRONT CONTROLLER
94. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND)




(a) Connect the cable to the negative (-) battery terminal.
NOTE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.
(b) Disconnect the DA and DF main body ECU connectors.
(c) Disconnect the L11 main body ECU connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(e) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU
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