Symptoms - Entertainment System
Important: The following steps must be completed before using the symptom tables.
1. Before using the symptom tables, perform a diagnostic check on the vehicle's system to ensure the following items are correct.
- There are no fault codes.
- The controllers can communicate over a serial line.
2. View system operation to familiarize yourself with the functions of the system.
Visual inspection / physical control
- Inspect aftermarket equipment that may affect the operation of the radio/audio system.
- Inspect easily accessible and visible parts of the system for obvious signs of damage or conditions that could lead to a malfunction.
Intermittent fault
Faulty electrical connections or wiring can cause intermittent faults. See paragraph "Checking for intermittent faults and poor contact in the connectors" in section 9A, "Body Wiring System".
Bad radio antenna
Using a test antenna
Important: To quickly check the function of the vehicle's antenna, use a test mast antenna. Disconnect the antenna feed connector from the radio input and connect the test antenna to it. Make sure that the base of the test antenna is connected to the vehicle chassis and do not touch the mast with your hands. Check radio reception in an area free from electromagnetic interference. Tune in to several weak and powerful radio stations in the MW / LW and VHF bands. If radio reception improves, there is a problem with the vehicle's antenna and/or feeder cable. If radio reception does not improve, see audio troubleshooting tips.
Antenna Ground Check
Important: To ensure the accuracy of the measurement, be sure to check the zero of the multimeter before each resistance measurement.
1. Disconnect the cable from the negative battery terminal.
2. Disconnect the antenna feed connector from the radio.
3. Measure the resistance between the negative battery cable and the outer conductor of the coaxial cable at the connector.
4. The measured resistance value should be no more than 0.20 ohms.
5. If the resistance is greater than 0.20 ohms, perform the following checks.
- Reliability of connection of the base of the antenna with the mass of the body.
- Reliability of intermediate connections of a coaxial cable and absence of corrosion in them.
- Check for an open or high resistance between the negative battery cable and the body.
Sound distortion - one or more speakers
Speakers - distortion
Important: The following table lists the causes of the failure in order from most likely to least likely. If the troubleshooting instructions recommend the replacement of a part, check for loose contacts before proceeding with the replacement. See paragraph "Checking for intermittent faults and poor contact in the connectors" in section 9A, "Body Wiring System".
Too high sound volume when set low
| Step | Operation | Values | Yes | No |
| 1 |
Is the lowest level set too loud?
|
-
|
Go to Step 2
|
System OK
|
| 2 |
Compare the volume with a similar car with exactly the same audio system.
Do cars sound the same?
|
-
|
System OK
|
Go to Step 5
|
| 3 |
Test the amplifier feedback signal circuit for an open or high resistance.
Has the cause been found and fixed?
|
-
|
Go to Step 9
|
Go to Step 4
|
| 4 |
Does the scan tool indicate the presence of an audio amplifier?
|
-
|
Go to Step 8
|
Go to Step 5
|
| 5 |
Inspect the harness connector at the radio for loose connections. Has the cause been found and fixed?
Is the repair finished?
|
-
|
Go to Step 9
|
Go to Step 7
|
| 6 |
Inspect the wiring harness connector on the audio amplifier for loose connections.
Has the cause been found and fixed?
|
-
|
Go to Step 9
|
Go to Step 8
|
| 7 |
Replace radio.
Has the replacement been completed?
|
-
|
Go to Step 9
|
-
|
| 8 |
Replace audio amplifier.
Has the replacement been completed?
|
-
|
Go to Step 9
|
-
|
| 9 |
Operate the system to check if the problem has been fixed.
Has the cause been removed?
|
-
|
System OK
|
Go to Step 2
|
Steering wheel controls not working
| Step | Operation | Values | Yes | No |
| 1 |
Check operation of all steering wheel controls.
Are all steering wheel controls working properly?
|
-
|
Go to item "Checking for intermittent faults and poor contact in the connectors" in section 9A, "Body Wiring System".
|
Go to Step 2
|
| 2 |
Test the radio signal circuit for a short to ground or an open.
Has the cause been found and fixed?
|
-
|
Go to Step 9
|
Go to Step 3
|
| 3 |
Attention! When performing maintenance work on parts of the SIR system (airbags), on the system wiring or near these parts, the SIR system must be disabled.
Do the measured resistances approximately correspond to the indicated values?
|
Volume boost: 1.2 kΩ; volume down: 1.56 kΩ; mode: 1.9 kΩ; volume cut-off: 2.38 kOhm; frequency setting up 3.1 kΩ; frequency setting down: 4.28 kΩ; tuning type: 6.65 kΩ; preset stations: 13.6 kΩ
|
Go to Step 4
|
Go to Step 6
|
| 4 |
Test the steering wheel control signal circuit for a short, high resistance, or open.
Has the cause been found and fixed?
|
-
|
Go to Step 9
|
Go to Step 5
|
| 5 |
Inspect the harness connector at the radio for loose connections.
Has the cause been found and fixed?
|
-
|
Go to Step 9
|
Go to Step 8
|
| 6 |
Inspect the steering wheel radio controls harness connector for loose connections.
Has the cause been found and fixed?
|
-
|
Go to Step 9
|
Go to Step 7
|
| 7 |
Replace the appropriate steering wheel radio control.
Has the replacement been completed?
|
-
|
Go to Step 9
|
-
|
| 8 |
Replace radio.
Has the replacement been completed?
|
-
|
Go to Step 9
|
-
|
| 9 |
Operate the system to check if the problem has been fixed.
Has the cause been removed?
|
-
|
System OK
|
Go to Step 1
|