Inspection Procedure 7

Inspection Procedure 7: GPS signal can not be received.

CAUTION: Whenever the audio visual navigation unit is replaced, ensure that the power supply circuit and the grounding circuit are normal. (Check that the voltage is 10 V or more.)

COMMENTS ON TROUBLE SYMPTOM
The GPS antenna or the audio visual navigation unit may be defective.

PROBABLE CAUSES
- The GPS antenna may be defective
- The audio visual navigation unit may be defective

DIAGNOSIS

STEP 1. Confirmation in MMCS service mode

Perform "Network/Connect Line Check" in the MMCS service mode to check that the communication and wire connection with the GPS antenna are OK. Service Mode

Q: Is the check result normal?

YES : Go to Step 2.

NO : Check that the GPS antenna is correctly connected to the audio visual navigation unit, and go to Step 2.

STEP 2. Check for the vehicles current position.

Check that the vehicle is parked at the place without the shield.

Q: Is the vehicle parked on the place without the shield?

YES : Go to Step 3.

NO : Move the vehicle to the place without the shield.

STEP 3. Confirming GPS signal reception

1. Activate the audio visual navigation unit.
2. Press the [INFO] button.
3. Select [Vehicle Position].
4. Wait for 5 minutes, and then check whether GPS signal can be received.

Q: Can GPS signal be received?

YES : The procedure is complete. (There is no failure)

NO : Go to Step 4.

STEP 4. Substitute a known good audio visual navigation unit, and check the trouble symptom.

1. Temporarily replace the audio visual navigation unit.
2. Activate the audio visual navigation unit.
3. Press the [INFO] button.
4. Select [Vehicle Position].
5. Check if the GPS signals are being received after 5 minutes have elapsed.

Q: Is the check result normal?

YES : Replace the audio visual navigation unit.

NO : Replace the GPS antenna.