Diagnosis code
No.04 Communication error with sunroof-ECU
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caution |
If diagnosis code No.04 is set
in the ETACS-ECU, diagnose the CAN bus
lines.
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The ETACS-ECU communicates with the
sunroof motor assembly (sunroof-ECU) through the SWS
communication line. If there is any trouble in that
communication, diagnosis code No.04 will
be set.
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note |
For vehicles without sunroof,
diagnosis code No.04 does not mean that there is
a problem.
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COMMENTS ON TROUBLE SYMPTOM
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The sunroof motor assembly
(sunroof-ECU), the ETACS-ECU, connector(s), or wiring
harness
between the two may be defective.
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- Malfunction of the sunroof motor assembly
(sunroof-ECU)
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
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Step 1. M.U.T.-III CAN bus diagnostics
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Use the M.U.T.-III to diagnose the
CAN bus lines.
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Q.
Is the check result normal?
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Go to Step
2.
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Repair the CAN bus
line (Refer to GROUP 54F - Troubleshooting ).
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Step 2.Check whether the diagnosis code is
reset.
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Check again if the diagnosis code
is set.
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(1)Erase the diagnosis code.
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(2)Ignition switch: LOCK (OFF) position to
ON
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(3)On completion, check that the diagnosis code is
not reset.
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Q.
Is the check result normal?
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If a trouble is
solved, it is determined that there is an intermittent
malfunction
such as poor engaged connector(s) or open circuit (Refer to
GROUP 00 - How to use troubleshooting/Inspection
Service Points ).
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Go to Step
3.
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Step 3. Connector check: E-07 sunroof motor assembly
connector
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![](../../../img/54/AC313434AB00ENG.png)
![](../../../img/54/AC313438AC00ENG.png)
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Q.
Is the check result normal?
Go to Step
4.
Repair
the defective connector.
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Step 4. Voltage measurement at the E-07 sunroof motor
assembly connector.
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![](../../../img/54/AC313434AB00ENG.png)
![](../../../img/54/AC313438AC00ENG.png)
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(1)Disconnect the connector, and
measure at the wiring harness side.
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![](../../../img/54/AC310507CF00ENG.png)
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(2)Voltage between E-07 sunroof
motor assembly connector terminal No.1 and body
earth (3)OK: System voltage
Q.
Is the check result normal?
Go to Step
6.
Go to Step
5.
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Step 5. Check the wiring harness between E-07 sunroof
motor assembly
connector terminal No.1 and fusible link
(5).
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![](../../../img/54/AC313393AN00ENG.png)
![](../../../img/54/AC313404AJ00ENG.png)
![](../../../img/54/AC313406AI00ENG.png)
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note |
Prior to the wiring harness
inspection, check intermediate connectors C-124,
C-128, and
repair if necessary.
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- Check the power supply line for open
circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
Repair the wiring
harness.
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Step 6. Voltage measurement at E-07 sunroof motor
assembly connector.
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![](../../../img/54/AC313434AB00ENG.png)
![](../../../img/54/AC313438AC00ENG.png)
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(1)Disconnect the connector, and
measure at the wiring harness side. (2)Turn the ignition
switch to the ON position.
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![](../../../img/54/AC310507CH00ENG.png)
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(3)Voltage between E-07 sunroof
motor assembly connector terminal No.2 and body
earth OK: System voltage
Q.
Is the check result normal?
Go to Step
8.
Go to Step
7.
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Step 7. Check the wiring harness between E-07 sunroof
motor assembly
connector terminal No.2 and ignition switch
(IG2).
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![](../../../img/54/AC313399AU00ENG.png)
![](../../../img/54/AC313409AS00ENG.png)
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note |
Prior to the wiring harness
inspection, check junction block connectors
C-202 and C-211,
and repair if necessary.
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- Check the power supply line to the ignition switch
(IG2) for open circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP - 00, How
to Cope with Intermittent Malfunction ).
Repair the wiring
harness.
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Step 8. Resistance measurement at the E-07 sunroof motor
assembly
connector.
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![](../../../img/54/AC313434AB00ENG.png)
![](../../../img/54/AC313438AC00ENG.png)
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(1)Disconnect the connector, and
measure at the wiring harness side.
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![](../../../img/54/AC310506BH00ENG.png)
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(2)Continuity between E-07 sunroof
motor assembly connector terminal No.5 and body
earth OK: 2 Ω or less
Q.
Is the check result normal?
Go to Step
10.
Go to Step
9.
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Step 9. Check the wiring harness between E-07 sunroof
motor assembly
connector terminal No.5 and body earth.
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![](../../../img/54/AC313434AB00ENG.png)
![](../../../img/54/AC313438AC00ENG.png)
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- Check the earth wires for open circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP - 00, How
to Cope with Intermittent Malfunction ).
Repair the wiring
harness.
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Step 10. Connector check: C-221 ETACS-ECU
connector
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![](../../../img/54/AC313400AB00ENG.png)
![](../../../img/54/AC313410AB00ENG.png)
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Q.
Is the check result normal?
Go to Step
11.
Repair
the defective connector.
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Step 11. Check the wiring harness between E-07 sunroof
motor assembly
connector terminal No.10 and C-221 ETACS-ECU connector
terminal No.59.
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![](../../../img/54/AC313393AM00ENG.png)
![](../../../img/54/AC313407AI00ENG.png)
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note |
Prior to the wiring harness
inspection, check joint connector C-01 and
intermediate connector
C-128, and repair if necessary.
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- Check the communication lines for open
circuit.
Q.
Is the check result normal?
Go to Step
12.
Repair
the wiring harness.
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Step 12. Check whether the diagnosis code is
reset.
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Replace the sunroof motor assembly
(sunroof-ECU), and then check that the diagnosis code
is not reset.
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(1)Replace the sunroof motor assembly
(sunroof-ECU).
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(3)On completion, check that diagnosis code No.04 is
not reset.
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Q.
Is diagnosis code No.04 set?
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Replace the
ETACS-ECU.
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The procedure is
complete.
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