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


caution
  • When diagnosis code No. C1915, C1925, C1935 or C1945 is set, be sure to diagnose the CAN bus line.
  • When replacing the ECU, always check that the communication circuit is normal.

DIAGNOSIS FUNCTION
When the TPMS transmitter(s) is in the OFF mode, this code is set.

PROBABLE CAUSES

  • Malfunction of CAN bus line
  • OFF mode cancellation not performed
  • Damaged wiring harness and connector
  • Malfunction of TPMS transmitter
  • Malfunction of ETACS-ECU <Vehicles without KOS> or KOS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting). On completion, go to Step 2.

STEP 2. Check whether the diagnosis code is set again.
(1)Turn the ignition switch (engine starting switch) from the "LOCK" (OFF) to "ON" position.
(2)Check if the diagnosis code is set.

Q. Is the diagnosis code set?
Go to Step 3.
The procedure is complete.

STEP 3. Diagnosis code check
(1)Drive the vehicle for 5 minutes.
(2)Turn the ignition switch (engine starting switch) from the "LOCK" (OFF) to "ON" position.
(3)Check if the diagnosis code is set.

Q. Are the all diagnosis codes C1915, C1925, C1935, C1945, C1955 set?
Replace the TPMS transmitters of all the four wheels, and register ID codes (Refer to ). Then go to Step 4.
Register the ID codes (Refer to ). Then go to Step 4 (The transmitter which is in OFF mode is replaced during ID registration process).

STEP 4. Check whether the diagnosis code is set again.
(1)Turn the ignition switch (engine starting switch) from the "LOCK" (OFF) to "ON" position.
(2)Check if the diagnosis code is set.

Q. Is the diagnosis code set?
Replace the KOS-ECU (Refer to GROUP 42B - KOS-ECU ) <Vehicles without KOS> or ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ) and register the ID codes. Then start over at Step 1.
The procedure is complete.