[54B] SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR <Hong Kong spec.> - - DIAGNOSTIC TROUBLE CODE PROCEDURES - Diagnosis code 31: Open circuit in the signal line between the SRS-ECU and the ETACS-ECU (impact detection signal) Diagnosis code 32: Short circuit in the signal line between the SRS-ECU and the ETACS-ECU (impact detection signal) | PRINT PAGE / INDEX / PRIOR / NEXT

Diagnosis code 31: Open circuit in the signal line between the SRS-ECU and the ETACS-ECU (impact detection signal) Diagnosis code 32: Short circuit in the signal line between the SRS-ECU and the ETACS-ECU (impact detection signal)
| CAUTION Whenever the ECU is replaced, ensure that the input signal circuit is normal.
| COMMENTS ON TROUBLE SYMPTOM If the voltage in the signal line between the SRS-ECU and the ETACS-ECU has exceeded 4.6 V for 40 milliseconds or more, the ETACS-ECU will set diagnosis code No.31 as an open circuit. If the signal line voltage has reached 1.5 V or less for at least 2.5 seconds, the ETACS-ECU will set diagnosis code No.32 as a short circuit. If the ignition switch is turned off, the ETACS-ECU will stop sending the diagnosis code.
| POSSIBLE CAUSES Malfunction of the SRS-ECU Malfunction of the ETACS-ECU Damaged harness wires and connectors
| DIAGNOSIS PROCEDURE
| Step 1. Use the MUT-II/III to confirm a diagnosis code. Check that the SRS-ECU sets a diagnosis code. Q: Is the check result normal? YES: Go to Step 2. NO: Refer to GROUP 52B - Troubleshooting .
| Step 2. Connector check: C-115 SRS-ECU connector and C-220 ETACS-ECU connector Q: Is the check result normal? YES: Go to Step 3. NO: Repair the connector.
| Step 3. Measure the resistance at the C-115 SRS-ECU connector. Disconnect the connector, and measure at the wiring harness side. Resistance between C-115 SRS-ECU connector terminal No.15 and body earth OK: Continuity exists. Q: Is the check result normal? YES: Go to Step 5. NO: Go to Step 4.
| Step 4. Check the wiring harness between C-115 SRS-ECU connector terminal No.15 and body earth. Check the earth wires for open circuit. Q: Is the check result normal? YES: The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ). NO: Repair the wiring harness.
| Step 5. Check the wiring harness between C-220 ETACS-ECU connector terminal No.29 and C-115 SRS-ECU connector terminal No.14. Check the communication lines for open circuit. Q: Is the check result normal? YES: Go to Step 6. NO: Repair the wiring harness.
| Step 6. Check whether the diagnosis code is reset. Replace the ETACS-ECU, and then check that the diagnosis code is not reset. Replace the ETACS-ECU. Ignition switch: ON Check that diagnosis code No.31 or 32 is not reset. Q: Is diagnosis code No.31 or 32 set? YES: Replace the SRS-ECU. NO: The procedure is complete.

[54B] SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR <Hong Kong spec.> - - DIAGNOSTIC TROUBLE CODE PROCEDURES - Diagnosis code 31: Open circuit in the signal line between the SRS-ECU and the ETACS-ECU (impact detection signal) Diagnosis code 32: Short circuit in the signal line between the SRS-ECU and the ETACS-ECU (impact detection signal) | PRINT PAGE / INDEX / PRIOR / NEXT

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