DESCRIPTION The radio and
display 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 Code | DTC Detection Condition |
Trouble Area | | B1579 |
Telephone microphone signal is lost. |
- Radio and display receiver assembly
- Telephone microphone assembly
- Harness or connector
| WIRING DIAGRAM
 PROCEDURE
| 1. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY) |
(a) Disconnect the J139 radio and display receiver assembly connector.
(b) Disconnect the W11 telephone microphone assembly connector. (c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
J139-4 (MACC) - W11-1 (MACC) |
Always | Below 1 Ω | |
J139-5 (MIN+) - W11-2 (MIC+) |
Always | Below 1 Ω | |
J139-19 (MIN-) - W11-4 (MIC-) |
Always | Below 1 Ω | |
J139-6 (SNS2) - W11-3 (SNS2) |
Always | Below 1 Ω | |
J139-4 (MACC) - Body ground |
Always | 10 kΩ or higher | |
J139-5 (MIN+) - Body ground |
Always | 10 kΩ or higher | |
J139-19 (MIN-) - Body ground |
Always | 10 kΩ or higher | |
J139-18 (SGND) - Body ground |
Always | 10 kΩ or higher | |
J139-6 (SNS2) - Body ground |
Always | 10 kΩ or higher |
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK |
 | |
| 2. |
CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY |
| (a) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
J139-18 (SGND) - Body ground |
Always | Below 1 Ω | |
J139-19 (MIN-) - Body ground |
Always | Below 1 Ω | |
 |
|
*a | Component with harness connected
(Radio and Display Receiver Assembly) | | |
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage: |
Tester Connection | Switch Condition |
Specified Condition | |
J139-4 (MACC) - Body ground |
Ignition switch ACC | 4 to 6 V | Result |
Result | Proceed to | |
OK | A | |
NG (for Column Shift Type) |
B | | NG (for Floor Shift Type) |
C |
| B |
| REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY |
| C |
| REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY |
|
A | |
| |
| 3. |
CHECK TELEPHONE MICROPHONE ASSEMBLY | (a) Replace the telephone microphone assembly with a known good one (See page
 ). (b) Clear the DTCs (See page
). (c) Check for DTCs (See page
). OK: No DTCs are output. Result |
Result | Proceed to | |
OK | A | |
NG (for Column Shift Type) |
B | | NG (for Floor Shift Type) |
C |
| A |
| END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE) |
| B |
| REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY |
| C |
| REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY | | 
