DESCRIPTION
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
U1002 |
Lost communication with the gateway module (MS bus). |
|
U1114 |
Lost communication with the main switch module. |
|
HINT:
For vehicles with CRAWL control only.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
PROCEDURE
1. |
DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL |
(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and branch wire.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable
is reconnected (See page ).
|
2. |
CHECK FOR OPEN IN CAN BUS MAIN WIRE (MAIN BODY ECU - DRIVE MONITOR SWITCH) |
(a) Disconnect the F10 main body ECU (multiplex network body ECU) connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
F10-9 (CANP) - F10-10 (CANN) |
Ignition switch off |
108 to 132 Ω |
*a |
Rear view of wire harness connector (to Main Body ECU [Multiplex Network Body ECU]) |
NG | ![]() |
GO TO STEP 4 |
|
3. |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND) |
(a) Connect the cable to the negative (-) battery terminal.
*a |
Rear view of wire harness connector (to Main Body ECU [Multiplex Network Body ECU]) |
*b |
Front view of wire harness connector (to Main Body ECU [Multiplex Network Body ECU]) |
NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable
is reconnected (See page ).
(b) Remove the main body ECU (multiplex network body ECU) (See page
).
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F10-3 (GND2) - Body ground |
Always |
Below 1 Ω |
A-11 (GND1) - Body ground |
Always |
Below 1 Ω |
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
A-31 (ALTB) - Body ground |
Always |
11 to 14 V |
A-30 (BECU) - Body ground |
Always |
11 to 14 V |
A-29 (ACC) - Body ground |
Ignition switch ACC |
11 to 14 V |
A-32 (IG) - Body ground |
Ignition switch ON |
11 to 14 V |
OK | ![]() |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
4. |
CONNECT CONNECTOR |
(a) Reconnect the F10 main body ECU (multiplex network body ECU) connector.
|
5. |
CHECK FOR OPEN IN CAN BUS MAIN WIRE (DRIVE MONITOR SWITCH - MAIN BODY ECU) |
(a) Disconnect the U1 drive monitor switch connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
U1-1 (CANP) - U1-2 (CANN) |
Ignition switch off |
108 to 132 Ω |
*a |
Rear view of wire harness connector (to Drive Monitor Switch) |
NG | ![]() |
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (MAIN BODY ECU - DRIVE MONITOR SWITCH) |
|
6. |
CHECK HARNESS AND CONNECTOR (DRIVE MONITOR SWITCH - BATTERY AND BODY GROUND) |
(a) Connect the cable to the negative (-) battery terminal. NOTICE: When disconnecting the cable, some systems need to be initialized after
the cable is reconnected (See page |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
U1-7 (GND) - Body ground |
Always |
Below 1 Ω |
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
U1-6 (+B) - Body ground |
Always |
11 to 14 V |
U1-12 (IG) - Body ground |
Ignition switch ON |
11 to 14 V |
*a |
Rear view of wire harness connector (to Drive Monitor Switch) |
OK | ![]() |
REPLACE DRIVE MONITOR SWITCH |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Definition Of Terms
DEFINITION OF TERMS
Term
Definition
Monitor description
Description of what the ECM monitors and how it detects malfunctions
(monitoring purpose and its details).
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