DTC U1115: Lost Communication with Tilt and Telescopic Module [08/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

RECONFIRM DTC OUTPUT

Reconfirm DTCs.

HINT:

If DTC U1002 is output from Main Body of the main 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
U1002 is not output from main body ECU (Techstream display: Main Body)	A
U1002 is output from main body ECU (Techstream display: Main Body)	B

B → See step 6

A: Go to next step

CHECK FOR OPEN IN SUB BUS 1 LINES (MULTIPLEX TILT AND TELESCOPIC ECU BRANCH LINE)

Disconnect the cable from the negative (-) auxiliary battery terminal.

Disconnect the H12 multiplex tilt and telescopic ECU connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

Tester Connection	Condition	Specified Condition
H12-3 (CANP) - H12-11 (CANN)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Multiplex Tilt and Telescopic ECU)

NG → REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU)

OK: Go to next step

CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Condition	Specified Condition
H12-1 (GND) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Multiplex Tilt and Telescopic ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

OK: Go to next step

CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

Connect the cable to the negative (-) auxiliary battery terminal.

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

Standard Voltage

Tester Connection	Condition	Specified Condition
H12-9 (ECUB) - Body ground	Always	11 to 14 V
H12-10 (IG) - Body ground	Power switch on (IG)	11 to 14 V

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Multiplex Tilt and Telescopic ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

OK → See step 5

REPLACE MULTIPLEX TILT AND TELESCOPIC ECU. Refer to REMOVAL [08/2013 - ]
GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC. Refer to DTC U1002: Lost Communication with Gateway Module (Main Body ECU) [08/2013 - ]