Code No. U1132: Failure information on SRS-ECU

caution

If diagnosis code No. U1132 is set in the combination meter, always diagnose the CAN bus lines.
Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.

TROUBLE JUDGMENT

The combination meter communicates with the SRS-ECU through CAN bus lines. If failure information is sent from the SRS-related signal, diagnosis code No. U1132 will be set.

COMMENT ON TROUBLE SYMPTOM

The M.U.T.-III shows a diagnosis code status as active.

The wiring harness wire or connectors may have loose, corroded, or damage terminals, or terminals pushed back in the connector, the SRS-ECU may be defective.

The M.U.T.-III shows a diagnosis code status as stored.

If diagnosis code No. U1132 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the SRS-ECU and the combination meter. For diagnosis procedures, refer to "How to treat past trouble" (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points ).

PROBABLE CAUSES

Malfunction of the SRS-ECU
Malfunction of the combination meter

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics

warning

Since the radiator fan rotates during CAN bus line diagnostics, make sure that no one is servicing the engine compartment before diagnosing the CAN bus line. Since the CAN communication stops when diagnosing the CAN bus line, the ETACS-ECU detects the time-out of the engine-ECU, and activates the radiator fan to prevent overheating as fail-safe.

Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to Step 2.

Repair the CAN bus line (Refer to GROUP 54C, Troubleshooting

). Repair the CAN bus line and go to Step 4.

STEP 2. M.U.T.-III other system diagnosis code

Check that the SRS-ECU sets a diagnosis code.

Q. Is the diagnosis code set?

Diagnose the SRS-ECU (Refer to GROUP 52B, Troubleshooting

). And then go to Step 3.

Go to Step 3.

STEP 3. Check whether the diagnosis code is reset.

Recheck if the diagnosis code is set.

(1)Erase the diagnosis code.

(2)Ignition switch: "LOCK" (OFF) position to "ON" position

(3)On completion, check that the diagnosis code is not reset.

Q. Is the diagnosis code set?

After the combination meter is replaced, then perform the variant coding and write the VIN data (Refer to GROUP 00, Precautions Before Service - How to Perform Variant Coding

). Then go to Step 4.

A poor connection, open circuit or other intermittent malfunction between the SRS-ECU and the combination meter (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points

STEP 4. Check whether the diagnosis code is reset.

Recheck if the diagnosis code is set.

(1)Erase the diagnosis code.

(2)Ignition switch: "LOCK" (OFF) position to "ON" position

(3)On completion, check that the diagnosis code is not reset.

Q. Is the diagnosis code set?

Return to Step 1.

The procedure is complete.