The navigation receiver assembly, map light assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.
Using this circuit, the telematics transceiver sends power to the map light assembly (telephone microphone assembly), and the map light assembly (telephone microphone assembly) sends microphone signals to the navigation receiver assembly via the telematics transceiver.
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.
Before replacing the telematics transceiver, refer to Service Bulletin.
Disconnect the I169 navigation receiver assembly connector.
Disconnect the T6 map light assembly (telephone microphone assembly) connector.
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I169-6 (SNS2) - T6-4 (SNS2) | Always | Below 1 Ω |
| I169-6 (SNS2) or T6-4 (SNS2) - Body ground | Always | 10 kΩ or higher |
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Disconnect the I169 navigation receiver assembly connector.
Disconnect the I72 telematics transceiver connector.
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I169-5 (MIN+) - I72-16 (MCO+) | Always | Below 1 Ω |
| I169-19 (MIN-) - I72-32 (MCO-) | Always | Below 1 Ω |
| I169-5 (MIN+) or I72-16 (MCO+) - Body ground | Always | 10 kΩ or higher |
| I169-19 (MIN-) or I72-32 (MCO-) - Body ground | Always | 10 kΩ or higher |
| I169-18 (SGND) - Body ground | Always | 10 kΩ or higher |
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Disconnect the I72 telematics transceiver connector.
Disconnect the T6 map light assembly (telephone microphone assembly) connector.
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I72-5 (MCVD) - T6-7 (MACC) | Always | Below 1 Ω |
| I72-6 (MCI+) - T6-6 (MCO+) | Always | Below 1 Ω |
| I72-7 (MCI-) - T6-5 (MCO-) | Always | Below 1 Ω |
| I72-5 (MCVD) - T6-7 (MACC) - Body ground | Always | 10 kΩ or higher |
| I72-6 (MCI+) - T6-6 (MCO+) - Body ground | Always | 10 kΩ or higher |
| I72-7 (MCI-) - T6-5 (MCO-) - Body ground | Always | 10 kΩ or higher |
| I72-23 (SGND) - Body ground | Always | 10 kΩ or higher |
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Reconnect the I169 navigation receiver assembly connector.
Reconnect the T6 map light assembly (telephone microphone assembly) connector.
| *a | Component with harness connected
(Navigation Receiver Assembly) |
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I169-18 (SGND) - Body ground | Always | Below 1 Ω |
| I169-19 (MIN-) - Body ground | Always | Below 1 Ω |
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Reconnect the I72 telematics transceiver connector.
| *a | Component with harness connected
(Telematics Transceiver) |
Measure the voltage according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I72-5 (MCVD) - Body ground | Engine switch on (ACC) | 4 to 6 V |
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I72-23 (SGND) - Body ground | Always | Below 1 Ω |
| I72-7 (MCI-) - Body ground | Always | Below 1 Ω |
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Remove the map light assembly (telephone microphone assembly).
| *a | Component without harness connected
(Map Light Assembly (Telephone Microphone Assembly)) |
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 4 (SNS2) - 5 (MCO-) | Always | Below 1 Ω |
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Turn the engine switch on (ACC).
| *a | Component with harness connected
(Map Light Assembly (Telephone Microphone Assembly)) |
Connect an oscilloscope to terminals 5 (MCO-) and 6 (MCO+) of the T6 map light assembly (telephone microphone assembly) connector.
Check the waveform of the map light assembly (telephone microphone assembly) using the oscilloscope.
| Result | Proceed to |
|---|---|
| A waveform synchronized with the voice input to the map light assembly (telephone microphone assembly) is output. | A |
| A waveform synchronized with the voice input to the map light assembly (telephone microphone assembly) is not output. | B |
A
B
Replace the telephone microphone assembly with a new or known good one.
Check if the same malfunction recurs.
| Result | Proceed to |
|---|---|
| Malfunction does not recur (returns to normal). | A |
| Malfunction recurs. | B |
A
B