NO.4 CANNOT TUNE (SEEK DOES NOT STOP)

id0903a3804600

4

Cannot tune (seek does not stop) / Possible DTC: 09:Er20, 09:Er22

POSSIBLE CAUSE

• Center panel malfunction
• Poor connection of antenna feeder plug
• Antenna feeder malfunction
• Audio unit malfunction
• Electronic jamming from outside, or inferior condition of broadcasting station radio wave
• Antenna rod is not installed
• Open or short circuit in wiring harness between audio unit and manual antenna (antenna amplifier power supply system)

Diagnostic procedure

STEP

INSPECTION

ACTION

1
• Verify that the SEEK switch is normal when the switch is operated.
• Is it normal?
Yes
Go to the next step.
No
Perform confirmation Step 1: audio panel switch confirmation. Replace the center panel if necessary.
2
• Inspect the indication on the information display.
• Does the frequency indication increase or decrease when the SEEK switch is operated?
Yes
Go to the next step.
No
Perform confirmation Step 1: audio panel switch confirmation. Replace the center panel if necessary.
3
• Manually tune to a local broadcasting station and check the reception condition.
• Is the reception normal?
Yes
Go to Step 6.
No
Go to the next step.
4
• Inspect the antenna feeder plug connection condition.
• Is the connection normal?
Yes
Go to the next step.
No
Insert the antenna feeder plug securely.
5
• Turn the ignition switch to the LOCK position.
• Measure the continuity between the antenna feeder axis and ground.
• Is there any continuity?
Yes
Replace antenna feeder.
No
Go to the next step.
6
• Turn the ignition switch to the LOCK position.
• Inspect the continuity between audio unit terminal H (24-pin) and manual antenna terminal A.
• Is there any continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness between the audio unit and the manual antenna (antenna amplifier power supply system), then verify the reception condition.
If the reception has improved, troubleshooting is completed.
If the reception has not improved, go to the next step.
7
• Measure the voltage at audio unit terminal H (24-pin) to verify the antenna amplifier power supply.
• Is the voltage B+?
Yes
Go to the next step.
No
Replace the audio unit.
8
• Check if the number of broadcasting stations changes depending on time and place.
• Does it change?
Yes
The system is normal. (Explain to customer that SEEK sometimes does not stop depending on the signal reception condition.)
Note
• Signals tend to reach longer distances at night. (It is conspicuous in AM signals, several audio functions may stop due to foreign broadcasting station or noise.) Though the audio system restrains sensitivity of SEEK and SCAN functions at night, the audio system may select broadcasting stations other than those desired when signals are considerably strong. This function is linked to the parking light. When the parking light or the headlights are turned on, SEEK and SCAN may not function for weak signals.
No
Replace audio unit.