Code No. C1915: Transmitter OFF mode tyre1
Code No. C1925: Transmitter OFF mode tyre2
Code No. C1935: Transmitter OFF mode tyre3
Code No. C1945: Transmitter OFF mode tyre4
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If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table  ).
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DIAGNOSTIC FUNCTION
When the TPMS transmitter(s) is in the OFF MODE, this code is set.
PROBABLE CAUSES
The most likely causes for this diagnosis code to be set are:
- OFF mode cancellation not performed
- Damaged wiring harness and connector
- Malfunction of TPMS transmitter
- Malfunction of ETACS-ECU <Vehicles without keyless operation system>
- Malfunction of KOS-ECU <Vehicles with keyless operation system>
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STEP 1. M.U.T.-III CAN bus diagnosis
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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 lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines
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Recheck if any of diagnosis codes No. C1915, C1925, C1935 and C1945 is set.
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(1)Turn the ignition switch from the "LOCK" (OFF) to "ON" position.
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(2)Check if the diagnosis codes are set.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. C1915, C1925, C1935 or C1945 set?
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Go to Step 3.
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The procedure is complete.
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STEP 3. Check whether the diagnosis code is set again.
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Recheck if the diagnosis code is set.
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(1)Drive the vehicle for five minutes.
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(2)Turn the ignition switch from the "LOCK" (OFF) to "ON" position.
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(3)Check if the diagnosis code is set.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Are all of diagnosis codes No. C1915, C1925, C1935 and C1945 set?
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Replace the TPMS transmitter (Refer to ), of all the four wheels, and register ID codes (Refer to ). Then go to Step 4.
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Register the ID codes (Refer to ). Then go to Step 4.
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STEP 4. Check whether the diagnosis code is set again.
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Recheck if the diagnosis code is set.
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(1)Turn the ignition switch from the "LOCK" (OFF) to "ON" position.
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(2)Check if the diagnosis code is set.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. C1915, C1925, C1935 or C1945 set?
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Replace the ETACS-ECU <Vehicles without keyless operation system> (Refer to ) or KOS-ECU <Vehicles with keyless operation system> (Refer to GROUP 42B, KOS-ECU ), and register the ID codes (Refer to ). Then start over at Step 1.
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The procedure is complete.
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