Pinpoint Test B: Poor Quality Or No Sound From One Or More Speakers (Not All Speakers) - Vehicles Without Sony(R) Sound
Information and Entertainment System
Pinpoint Test B: Poor Quality Or No Sound From One Or More Speakers (Not All Speakers) - Vehicles Without Sony(R) Sound
Normal Operation
The ACM (Audio Front Control Module) directs audio signals to the speakers in the form of an AC voltage. The ACM (Audio Front Control Module) provides internal circuit protection for shorts to ground or shorts to voltage.
A short to ground or short to voltage in the circuitry to one of the speakers can cause multiple speakers to lose sound due to the built-in overload protection feature of the ACM (Audio Front Control Module). In this case, a speaker fault DTC sets (all except base AM/FM ACM (Audio Front Control Module) ), and this pinpoint test should be followed to isolate the damaged circuit.
The speaker walk test can be used to isolate a concern with a particular speaker. This can reduce the diagnostic steps necessary to isolate the concern. To carry out the speaker walk test, refer to Audio Control Module (ACM) Self-Diagnostic Mode Service and Repair.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Speaker
- ACM (Audio Front Control Module)
PINPOINT TEST B : POOR QUALITY OR NO SOUND FROM ONE OR MORE SPEAKERS (NOT ALL SPEAKERS) - VEHICLES WITHOUT SONY(R) SOUND
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
B1 CHECK THE AUDIO SIGNALS TO THE SUSPECT SPEAKER
- Ignition OFF.
- Disconnect: Suspect Speaker.
- Operate the audio system in radio tuner (AM/FM) mode.
- Measure the AC voltage between the suspect speaker pin 1 and pin 2, harness side as follows:
Suspect Speaker Positive Meter Lead Negative Meter Lead LH front C523-1
VME07 (WH) C523-2
RME07 (WH/BN) RH front C612-1
VME10 (WH/VT) C612-2
RME10 (WH/OG) LH rear C702-1
VME09 (WH/GN) C702-2
RME09 (BN/YE) RH rear C802-1
VME12 (BN/WH) C802-2
RME12 (BN/BU) LH front tweeter C230-1
VME07 (WH) C230-2
RME07 (WH/BN) RH front tweeter C231-1
VME10 (WH/VT) C231-2
RME10 (WH/OG)
Is a fluctuating AC voltage present?
Yes
INSTALL a new speaker for the suspect speaker. REFER to Speaker - Door , Speaker - Instrument Panel or Speaker - A-Pillar . CLEAR any DTCs present. TEST the system for normal operation.
No
GO to B2.
B2 CHECK THE CIRCUITS TO THE SUSPECT SPEAKER FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: ACM (Audio Front Control Module) C290A.
- Ignition ON.
- Measure the voltage between the suspect speaker pins, harness side and ground as follows:
Suspect Speaker Positive Meter Lead Negative Meter Lead LH front C523-1
VME07 (WH) Ground C523-2
RME07 (WH/BN) Ground RH front C612-1
VME10 (WH/VT) Ground C612-2
RME10 (WH/OG) Ground LH rear C702-1
VME09 (WH/GN) Ground C702-2
RME09 (BN/YE) Ground RH rear C802-1
VME12 (BN/WH) Ground C802-2
RME12 (BN/BU) Ground LH front tweeter C230-1
VME07 (WH) Ground C230-2
RME07 (WH/BN) Ground RH front tweeter C231-1
VME10 (WH/VT) Ground C231-2
RME10 (WH/OG) Ground
Is any voltage present?
Yes
REPAIR the circuit in question. CLEAR any DTCs present. TEST the system for normal operation.
No
GO to B3.
B3 CHECK THE CIRCUITS TO THE SUSPECT SPEAKER FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between the suspect speaker, harness side and the ACM (Audio Front Control Module) harness side; and between the suspect speaker, harness side and ground as follows:
Suspect Speaker Positive Meter Lead Negative Meter Lead Circuit LH front C523-1 C290A-8 VME07 (WH) C523-2 C290A-21 RME07 (WH/BN) RH front C612-1 C290A-11 VME10 (WH/VT) C612-2 C290A-12 RME10 (WH/OG) LH rear C702-1 C290A-9 VME09 (WH/GN) C702-2 C290A-22 RME09 (BN/YE) RH rear C802-1 C290A-10 VME12 (BN/WH) C802-2 C290A-23 RME12 (BN/BU) LH front tweeter C230-1 C290A-8 VME07 (WH) C230-2 C290A-21 RME07 (WH/BN) RH front tweeter C231-1 C290A-11 VME10 (WH/VT) C231-2 C290A-12 RME10 (WH/OG)
Is the resistance less than 5 ohms between the suspect speaker and the ACM (Audio Front Control Module) and greater than 10,000 ohms between the suspect speaker and ground?
Yes
REPAIR the circuit in question. CLEAR any DTCs present. TEST the system for normal operation.
No
GO to B4.
B4 CHECK FOR CORRECT ACM (Audio Front Control Module) OPERATION
- Ignition OFF.
- Connect: All Disconnected Connectors.
- Disconnect all the ACM (Audio Front Control Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the ACM (Audio Front Control Module) 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 (Audio Front Control Module). REFER to 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 any DTCs present.