Insert the key into the ignition switch (LOCK position), then measure changes in voltage between the antenna connectors.
Connector & terminal
(B142) No. 1 (+) — No. 2 (−):
QUESTION
Is the voltage −30 to 30 V? (Approx. 0.1 second after inserting the key) Is the voltage 0 V? (Approx. 1 second after inserting the key)
Yes
No
Replace the IMM ECM and then replace all ignition keys (including the transponder). Then perform teaching operation. Refer to the teaching operation manual (Pub. No. S0820GZ).