Toyota CH-R Service Manual: Lost Communication with Gateway Module (U1002)
DESCRIPTION
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
U1002 |
Lost Communication with Gateway Module |
When the ignition switch is ON, a communication error between the forward recognition camera and millimeter wave radar sensor assembly is detected for approximately 0.3 seconds. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
- Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
- After turning the ignition switch off, waiting time may be required
before disconnecting the cable from the negative (-) battery terminal. Therefore,
make sure to read the disconnecting the cable from the negative (-) battery
terminal notices before proceeding with work.
Click here
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- If the forward recognition camera has been replaced with a new one,
be sure to perform forward recognition axis adjustment.
Click here
- When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.
HINT:
- Operating the ignition switch, any other switches or a door triggers related ECUs and sensors to communicate using the CAN communication system. This communication will cause the resistance value to change.
- Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the connectors of ECUs or wire harnesses while performing the inspection below may help determine the cause of the malfunction.
PROCEDURE
|
1. |
CHECK FOR DTCs (PRE-COLLISION SYSTEM) |
(a) Check for DTCs.
Click here
|
Result |
Proceed to |
|---|---|
|
DTC U023A and/or U1002 and other DTCs are output |
A |
|
Only DTC U023A and/or U1002 is output |
B |
| A | .gif) |
GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
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|
2. |
CHECK FOR OPEN IN CAN BUS SUB LINES (FORWARD RECOGNITION CAMERA) |
(a) Disconnect the cable from the negative (-) battery terminal.
|
(b) Disconnect the forward recognition camera connector. |
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R5-6 (CANH) - R5-12 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
(d) Connect the forward recognition camera connector.
| NG | |
REPAIR OR REPLACE CAN BUS SUB LINE OR CONNECTOR (FORWARD RECOGNITION CAMERA - MILLIMETER WAVE RADAR SENSOR ASSEMBLY) |
|
|
3. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE (FORWARD RECOGNITION CAMERA)) |
|
(a) Disconnect the forward recognition camera connector. |
|
(b) Connect the cable to the negative (-) battery terminal.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
R5-7 (IGB) - Body ground |
Ignition switch ON |
11 to 14 V |
(d) Connect the forward recognition camera connector.
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
|
|
4. |
CHECK HARNESS AND CONNECTOR (FORWARD RECOGNITION CAMERA - BODY GROUND) |
|
(a) Disconnect the forward recognition camera connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R5-10 (GND) - Body ground |
Always |
Below 1 Ω |
(c) Connect the forward recognition camera connector.
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE (MILLIMETER WAVE RADAR SENSOR ASSEMBLY)) |
|
(a) Disconnect the millimeter wave radar sensor assembly connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
A2-8 (IGB) - Body ground |
Ignition switch ON |
11 to 14 V |
(c) Connect the millimeter wave radar sensor assembly connector.
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
|
|
6. |
CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - BODY GROUND) |
|
(a) Disconnect the millimeter wave radar sensor assembly connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A2-1 (SGND) - Body ground |
Always |
Below 1 Ω |
(c) Connect the millimeter wave radar sensor assembly connector.
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
7. |
REPLACE FORWARD RECOGNITION CAMERA |
(a) Replace the forward recognition camera.
Click here
(b) Perform forward recognition axis adjustment.
Click here
|
|
8. |
CHECK FOR DTCs (PRE-COLLISION SYSTEM) |
(a) Clear the DTCs.
Click here
(b) Make sure that the DTC detection conditions are met.
HINT:
If the detection conditions are not met, the system cannot detect the malfunction.
(c) Check for DTCs.
Click here
|
Result |
Proceed to |
|---|---|
|
DTC U023A is not output |
A |
|
DTC U023A is output |
B |
| A | |
END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE) |
|
|
9. |
REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
(a) Replace the millimeter wave radar sensor assembly.
Click here
(b) Adjust the millimeter wave radar sensor assembly.
Click here
|
|
10. |
CLEAR DTC (PRE-COLLISION SYSTEM) |
(a) Clear the DTCs.
Click here
| NEXT | |
END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE) |
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Toyota C-HR (AX20) 2023-2026 Owner's Manual
Toyota CH-R Owners Manual
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Toyota CH-R Service Manual
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