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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Correct the CAN bus
line. (Refer to Group 54F - Diagnosis .)
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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 diagnosis code No.04 set?
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Go to Step
3.
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The trouble can be
an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
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Step 3. Connector check: E-07 sunroof motor assembly
connector
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![](../../../img/54/AC313438AB00ENG.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/AC313438AB00ENG.png)
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(1)Disconnect the connector, and
measure at the wiring harness side.
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![](../../../img/54/AC310507EP00ENG.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 to fusible link
(5).
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![](../../../img/54/AC313414AG00ENG.png)
![](../../../img/54/AC313416AE00ENG.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 the E-07 sunroof motor
assembly connector.
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![](../../../img/54/AC313438AB00ENG.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 to ignition switch
(IG2).
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![](../../../img/54/AC313418AC00ENG.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/AC313438AB00ENG.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: 2Ω 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 to body earth.
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![](../../../img/54/AC313438AB00ENG.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/AC313421AB00ENG.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 to C-221 ETACS-ECU connector
terminal No.59.
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![](../../../img/54/AC313417AH00ENG.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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