Lexus ES: Voice Recognition Microphone Disconnected (B1579)
DESCRIPTION
The radio receiver assembly and telephone microphone assembly are connected to each other using the microphone connection detection signal lines.
This DTC is stored when a microphone connection detection signal line is disconnected.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B1579 | Voice Recognition Microphone Disconnected | Microphone signal is lost. |
|
- *: w/ Manual (SOS) Switch
WIRING DIAGRAM
w/o Manual (SOS) Switch
w/ Manual (SOS) Switch 
CAUTION / NOTICE / HINT
NOTICE:
-
Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System.
Click here
.gif)
-
When replacing the radio receiver assembly, always replace it with a new one. If a radio receiver assembly which was installed to another vehicle is used, the following may occur:
- A communication malfunction DTC may be stored.
- The radio receiver assembly may not operate normally.
-
Before replacing the DCM (telematics transceiver), refer to Registration.
Click here
PROCEDURE
| 1. | INSPECT RADIO RECEIVER ASSEMBLY |
| (a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| NG |  | REPLACE RADIO RECEIVER ASSEMBLY |
|
| 2. | CHECK MODEL |
(a) Choose the model to be inspected.
| Result | Proceed to |
|---|---|
| w/ Manual (SOS) Switch | A |
| w/o Manual (SOS) Switch | B |
| B | | GO TO STEP 7 |
|
| 3. | CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - TELEPHONE MICROPHONE ASSEMBLY) |
(a) Disconnect the G128 DCM (telematics transceiver) connector.
(b) Disconnect the P18 telephone microphone assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G128-7 (MCI-) - P18-4 (MCO-) | Always | Below 1 Ω |
| G128-7 (MCI-) or P18-4 (MCO-) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER)) |
(a) Disconnect the G3 radio receiver assembly connector.
(b) Disconnect the G128 DCM (telematics transceiver) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G3-22 (MIN-) - G128-32 (MCO-) | Always | Below 1 Ω |
| G3-22 (MIN-) or G128-32 (MCO-) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 5. | CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY) |
(a) Disconnect the G3 radio receiver assembly connector.
(b) Disconnect the P18 telephone microphone assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G3-25 (SNS2) - P18-3 (SNS2) | Always | Below 1 Ω |
| G3-25 (SNS2) or P18-3 (SNS2) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 6. | INSPECT DCM (TELEMATICS TRANSCEIVER) |
(a) Reconnect the G128 DCM (telematics transceiver) connector.
(b) Reconnect the G3 radio receiver assembly connector.
| (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
(d) Proceed to the next step based on the inspection result.
| OK | | GO TO STEP 8 |
| NG | | REPLACE DCM (TELEMATICS TRANSCEIVER) |
| 7. | CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY) |
(a) Disconnect the G3 radio receiver assembly connector.
(b) Disconnect the P18 telephone microphone assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G3-25 (SNS2) - P18-3 (SNS2) | Always | Below 1 Ω |
| G3-22 (MIN-) - P18-4 (MCO-) | Always | Below 1 Ω |
| G3-25 (SNS2) or P18-3 (SNS2) - Body ground | Always | 10 kΩ or higher |
| G3-22 (MIN-) or P18-4 (MCO-) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 8. | INSPECT TELEPHONE MICROPHONE ASSEMBLY |
(a) Remove the telephone microphone assembly.
Click here
| (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
.png)
| OK | | REPLACE RADIO RECEIVER ASSEMBLY |
| NG | | REPLACE TELEPHONE MICROPHONE ASSEMBLY |
READ NEXT:
USB Device Malfunction (B1585)
DESCRIPTION This DTC is stored when a malfunction occurs in a connected device. DTC No. Detection Item DTC Detection Condition Trouble Area B1585 USB Device Malfunction When any of th
Black Screen
PROCEDURE 1. CHECK DISPLAY SETTING (a) Check that the display is not in screen off mode. OK: The display setting is not in screen off mode. NG CHANGE SCREEN TO SCREEN ON MODE
Camera ECU Malfunction (C1610)
DESCRIPTION This DTC is stored when a malfunction occurs in the parking assist monitor system*1 or panoramic view monitor system*2. DTC No. Detection Item DTC Detection Condition Trouble Area
SEE MORE:
Operation Check
OPERATION CHECK CHECK WINDOW DEFOGGER SYSTEM (a) Turn the engine switch on (IG). (b) Check that the rear window defogger wire becomes warm by operating the rear window defogger switch of the air conditioning control assembly. (c) When the vehicle is stopped, confirm that the window defogger system o
Brake Override System
DESCRIPTION When the vehicle is being driven with the accelerator pedal depressed, depressing the brake pedal without releasing the accelerator pedal will activate the brake override system to restrict hybrid system output. The conditions for activating the brake override system as well as the items
