Pinpoint Test A: Poor Reception
Information and Entertainment System
Pinpoint Tests
Pinpoint Test A: Poor Reception
Normal Operation
Audio waves are received by the antenna grid (located in the rear glass) and transferred to the audio unit through the antenna cable. The radio suppression equipment reduces interference caused by the electrical components of the ignition and charging systems. When the SEEK/SCAN button is pressed, the audio unit searches for a channel with sufficient audio signal strength and automatically stops when it reaches one.
- DTC B2103 (Antenna Not Connected) - sets when the antenna signal is lower than the pre-configured threshold value during the audio unit self-test.
This pinpoint test is intended to diagnose the following:
- Antenna
- Antenna cable
- Noise suppression equipment
- Charging system
- Ignition system
- Audio unit
PINPOINT TEST A: POOR RECEPTION
NOTE: A break in the defroster grid will not cause an audio reception concern. It is normal for an audible popping sound to be heard when turning the defroster on or off. Advise the customer of the condition.
-------------------------------------------------
A1 CHECK THE RADIO SIGNAL RECEPTION
- Check the audio unit signal reception with the engine running and with the engine off.
- Is the audio unit signal reception noisy/missing only with the engine running?
Yes
GO to A2.
No
GO to A7.
-------------------------------------------------
A2 CHECK THE SUPPRESSION EQUIPMENT
- Check all required suppression equipment, radio frequency interference suppression bond, and the hood bonding strap for security, cleanliness, and metal-to-metal contact.
- Check the bolts holding the antenna module and ground to the rear shelf for security, cleanliness, and metal-to-metal contact.
- Are the contacts clean, secure, and in metal-to-metal contact?
Yes
GO to A3.
No
CLEAN or SECURE the connections as necessary. TEST the system for normal operation.
-------------------------------------------------
A3 CHECK THE CAPACITOR MOUNTING AND CONNECTING CIRCUITS
NOTE: The capacitor mounting points are used to complete the electrical circuit and must be mounted securely to clean surfaces.
- Check the mounting and connecting circuits of the radio ignition interference capacitor(s) for security, cleanliness, and metal-to-metal contact.
- Are the contacts clean, secure, and in metal-to-metal contact?
Yes
GO to A4.
No
CLEAN or SECURE the connections as necessary. TEST the system for normal operation.
-------------------------------------------------
A4 CHECK THE RADIO IGNITION INTERFERENCE CAPACITOR(S) AND THE GENERATOR
- Ignition OFF.
- Check the operation of the radio ignition interference capacitor(s) or suppression equipment by installing a known good component(s).
- Check the generator by disconnecting the wiring harness from the voltage regulator.
- Start the vehicle.
- Check the operation of the audio unit.
- Is the reception OK?
Yes
REPAIR or INSTALL new components as necessary. TEST the system for normal operation.
No
GO to A5.
-------------------------------------------------
A5 CHECK THE IGNITION CIRCUITS
- Ignition OFF.
- Check the ignition circuits for correct routing, grounding, and security of the connections.
- Are the circuits OK?
Yes
GO to A6.
No
REPAIR the circuits as necessary. TEST the system for normal operation.
-------------------------------------------------
A6 CHECK THE IGNITION SYSTEM
- Test the ignition system. Refer to Computers and Control Systems Information.
- Is the ignition system OK?
Yes
INSTALL a new audio unit. REFER to Audio Unit Service and Repair. TEST the system for normal operation.
No
REPAIR the ignition system. TEST the system for normal operation.
-------------------------------------------------
A7 CHECK THE ON-GLASS ANTENNA FOR DAMAGE
- Ignition OFF.
- Disconnect: Antenna Lead Terminal.
- Measure the resistance between the antenna cable lead terminal and the end of the antenna grid wire.
- Is the resistance less than 8 ohms?
Yes
GO to A8.
No
REPAIR the grid lines as necessary. CLEAR the DTCs. REPEAT the self-test.
-------------------------------------------------
A8 SUBSTITUTE THE ANTENNA EXTENSION CABLE(S)
- Ignition OFF.
- Substitute a known good antenna cable between the antenna grid and the audio unit.
- Ignition ON.
- Check the operation of the audio unit.
- Is the reception OK?
Yes
INSTALL a new antenna cable. CLEAR the DTCs. REPEAT the self-test.
No
INSTALL the original antenna cable. INSTALL a new audio unit. REFER to Audio Unit Service and Repair. TEST the system for normal operation after the repair.
-------------------------------------------------