Inspection Procedure
4: Check the power supply and earth circuit to the receiver antenna.
COMMENTS ON TROUBLE SYMPTOM
If receiver antenna does not work at all (keyless entry or immobilizer cannot operate),
the power supply or earth circuit system of receiver antenna may be faulty.
PROBABLE CAUSES
Damaged wiring harness and connectors
Malfunction of receiver antenna
DIAGNOSIS PROCEDURE
STEP 1. Voltage measurement at the receiver antenna connector
(5V line).
(1)Disconnect the connector and measure the resistance at the wiring harness side.
(2)Measure the voltage between the receiver antenna connector (5V line) and the body
earth. OK: System voltage
Q.
Is the check result normal?
Go to Step 3.
Go to Step 2.
STEP 2. Check of open circuit in 5V line between receiver antenna connector
and ETACS-ECU connector.
Q.
Is the check result normal?
Go to Step 3.
Repair the connector(s) wiring harness.
STEP 3. Resistance measurement at the receiver antenna connector (GND
line).
(1)Disconnect the connector and measure the resistance at the wiring harness side.
(2)Measure the resistance between the receiver antenna connector (GND line) and the
body earth. OK: Continuity exists (2 Ω or less)
Q.
Is the check result normal?
The diagnosis is complete.
Go to Step 4.
STEP 4. Check of short to earth, and open circuit in GND line between receiver
antenna connector and ETACS-ECU connector.
Go to Step 2.