IMMOBILIZER (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P1570 ANTENNA

DTC DETECTING CONDITION:

Faulty antenna

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK ANTENNA CIRCUIT.

1) Turn the ignition switch to OFF.

2) Disconnect the harness antenna connector from the IMM ECM.

3) Measure the resistance of the antenna circuit.

Connector & terminal

(B141) No. 1 — No. 14:

Is the resistance less than 10 Ω?

Replace the antenna.

2.CHECK ANTENNA CIRCUIT.

Measure the resistance between antenna harness connector and chassis ground.

Connector & terminal

(B141) No. 1 — Chassis ground:

Is the resistance less than 10 Ω?

Replace the antenna.

3.CHECK ANTENNA CIRCUIT.

Measure the resistance between antenna harness connector and chassis ground.

Connector & terminal

(B141) No. 14 — Chassis ground:

Is the resistance less than 10 Ω?

Replace the antenna.

4.CHECK ANTENNA CIRCUIT.

1) Turn the ignition switch to ON. (engine OFF)

2) Measure the voltage between antenna harness connector and chassis ground.

Connector & terminal

(B141) No. 1 (+) — Chassis ground (−):

Is the voltage 0 V?

Replace the antenna.

5.CHECK ANTENNA CIRCUIT.

Measure the voltage between antenna harness connector and chassis ground.

Connector & terminal

(B141) No. 14 (+) — Chassis ground (−):

Is the voltage 0 V?

Replace the antenna.

6.CHECK IMM ECM FUNCTION.

1) Turn the ignition switch to OFF.

2) Connect the antenna harness connector to IMM ECM.

3) Insert the key into the ignition switch, then measure changes in voltage between the antenna harness connectors.

Connector & terminal

(B141) No. 1 (+) — No. 14 (−):

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)

Replace the IMM ECM and then replace all ignition keys (including the transponder). Execute the registration procedure next. Refer to REGISTRATION MANUAL FOR IMMOBILIZER (Pub. No. S0820GZ).

7.CHECK IGNITION KEY (TRANSPONDER).

1) Remove the key from ignition switch.

2) Start the engine using other key which is already registered.

Does the engine start?

Replace the ignition key (including the transponder). Execute the registration procedure next. Refer to REGISTRATION MANUAL FOR IMMOBILIZER (Pub. No. S0820GZ).

Replace the IMM ECM and then replace all ignition keys (including the transponder). Execute the registration procedure next. Refer to REGISTRATION MANUAL FOR IMMOBILIZER (Pub. No. S0820GZ).