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Pinpoint Test A: Poor Reception - AM/FM




Information and Entertainment System

Pinpoint Tests

Pinpoint Test A: Poor Reception - AM/FM

Refer to Wiring Diagram Set 130, Audio System/Navigation for schematic and connector information. Diagrams By Number

Normal Operation - Sedan

The radio antenna, integral to the rear window glass, receives AM and FM radio waves. The antenna module, which receives voltage from the Audio Control Module (ACM) through circuit CME44 (YE/GN), sends the radio waves to the ACM through the antenna cable.

Wagon

The fixed radio antenna receives AM and FM radio waves and sends them to the ACM.

The noise suppression equipment reduces engine ignition and electrical systems interference transmitted through the speakers.

- DTC B2103 (Antenna Not Connected) - sets during the antenna connected test (part of the ACM self-test) when the signal strength is less than the pre-configured threshold value. In order for this DTC to set, the ACM must be tuned to AM, and the self-test must be run with the scan tool.

This pinpoint test is intended to diagnose the following:

- RDS/PTY function setting
- Wiring, terminals or connectors (sedan only)
- Antenna
- Antenna cable
- Antenna module (sedan only)
- Charging system
- Ignition system
- Noise suppression equipment
- ACM



PINPOINT TEST A: POOR RECEPTION - AM/FM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

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A1 VERIFY THE RDS/PTY SETTING


- Verify the RDS/PTY function is set to ALL.
- For non-navigation audio systems, press MENU repeatedly until RBDS (ON/OFF) appears on the display, then press the TUNE UP or TUNE DOWN button until ALL is displayed.
- For navigation audio systems, while in FM mode, press SHOW OPTIONS, make sure RDS is active, then press SET PTY and select ALL.
- Press the SEEK DOWN or SEEK UP button to scan for a good channel.
- Is a good channel found?

Yes
The system is operating correctly at this time. The cause of the concern was that no channel in the selected category was found.

No
GO to A2.

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A2 CHECK THE AUDIO SYSTEM RECEPTION


- Check the audio system signal reception with the engine running, and with the engine off.
- Does the poor reception only occur with the engine running?

Yes
GO to A3.

No
GO to A6.

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A3 CHECK THE NOISE SUPPRESSION EQUIPMENT


- Ignition OFF.
- Check all required noise suppression equipment and the radio frequency interference suppression bond for security, cleanliness, and metal-to-metal contact.
- Are the connections clean, secure, and in metal-to-metal contact?

Yes
GO to A4.

No
CLEAN and SECURE the connections, or INSTALL new suppression equipment as necessary. TEST the system for normal operation.

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A4 CHECK THE GENERATOR


- Check the generator by disconnecting the wiring harness from the voltage regulator.
- Start the vehicle.
- Operate the audio system in radio tuner (AM/FM) mode.
- Is the reception OK?

Yes
INSTALL a new generator. TEST the system for normal operation.

No
GO to A5.

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A5 CHECK THE IGNITION CIRCUITS


- Ignition OFF.
- Connect the wiring harness to the voltage regulator.
- Check the ignition circuits for correct routing, grounding, and integrity of the connections.
- Check the spark plugs and ignition coils.
- Are the ignition components OK?

Yes
GO to A6.

No
REPAIR the ignition system as necessary. TEST the system for normal operation.

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A6 CHECK THE ANTENNA COAXIAL CABLE


- Disconnect: Antenna Coaxial Cable (At Antenna or Antenna Module).
- Disconnect: Antenna Coaxial Cable (At ACM).
- Measure the resistance of the antenna cable core between the ACM and the antenna or antenna module.
- Measure the resistance of the antenna cable between the core and shield of the antenna cable.
- Is the resistance less than 1 ohm between the ACM and the antenna or antenna module and greater than 10,000 ohms between the antenna cable core and shield?

Yes
For sedan, GO to A7.

For wagon, GO to A11.

No
INSTALL a new antenna cable. REFER to Antenna Cable - Satellite Radio Antenna Cable - Satellite Radio. CLEAR the DTCs. REPEAT the self-test.

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A7 CHECK CIRCUIT CME44 (YE/GN) FOR VOLTAGE


- Disconnect: Antenna Module C9021.
- Operate the audio system in radio tuner (AM/FM) mode.
- Measure the voltage between the antenna module C9021-1, circuit CME44 (YE/GN), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to A9.

No
GO to A8.

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A8 CHECK CIRCUIT CME44 (YE/GN) FOR AN OPEN OR SHORT TO GROUND


- Ignition OFF.
- Disconnect: ACM C240a.
- Measure the resistance between the ACM, C240a-5, circuit CME44 (YE/GN), harness side and the antenna module C9021-1, circuit CME44 (YE/GN), harness side; and between the ACM C240a-5, circuit CME44 (YE/GN), harness side and ground.




- Is the resistance less than 5 ohms between the ACM and the antenna module, and greater than 10,000 ohms between the ACM and ground?

Yes
GO to A9.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

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A9 CHECK THE ANTENNA GRID


- Inspect the antenna grid closely for signs of damage.
- Is the antenna grid OK?

Yes
GO to A10.

No
REPAIR the antenna grid as necessary. REFER to Windows. TEST the system for normal operation.

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A10 ISOLATE THE ANTENNA MODULE


- Ignition OFF.
- Install a new antenna module.
- Operate the audio system in radio tuner (AM/FM) mode.
- Is the reception OK?

Yes
The system is operating correctly at this time. The concern was caused by an inoperative antenna module. CLEAR the DTCs. REPEAT the self-test.

No
GO to A12.

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A11 ISOLATE THE ANTENNA


- Connect: Antenna Coaxial Cable (At ACM).
- Install a new antenna. Refer to Antenna Service and Repair.
- Operate the audio system in radio tuner (AM/FM) mode.
- Is the reception OK?

Yes
The system is operating correctly at this time. The concern was caused by an inoperative antenna. CLEAR the DTCs. REPEAT the self-test.

No
GO to A12.

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A12 ISOLATE THE ANTENNA CABLE


- Ignition OFF.
- Install a new antenna cable. Refer to Antenna Cable - Satellite Radio Antenna Cable - Satellite Radio.
- Operate the audio system in radio tuner (AM/FM) mode.
- Is the reception OK?

Yes
The system is operating correctly at this time. The concern was caused by an inoperative antenna cable. CLEAR the DTCs. REPEAT the self-test after the repair.

No
GO to A13.

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A13 CHECK FOR CORRECT ACM OPERATION


- Disconnect all the ACM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the ACM connectors and make sure they seat correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?

Yes
INSTALL a new ACM. REFER to Audio Control Module (ACM) Audio Control Module (ACM). TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

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