Navigation System (for HDD)

NAVIGATION: NAVIGATION SYSTEM (for HDD): B1591, B15D1: No Response from Audio HU
B1591 - No Response from Audio HU
B15D1 - Audio HU Disconnectedn

DESCRIPTION

The display and navigation module display and radio receiver assembly are connected by the MOST communication line.

When a MOST communication error occurs between the display and navigation module display and radio receiver assembly, this DTC will be stored.





HINT
* *: Even if no fault is present, this DTC may be stored depending on the battery condition or engine start voltage.
* The display and navigation module display is the master unit.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. CHECK OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING)

(a) Check that optional components (including associated wiring) which generate radio waves are not installed.

Result





HINT
* Electrical noise from radio waves generated by optional components or the wiring for those components may affect MOST communication.
* This DTC may be stored when a MOST communication error occurs due to electrical noise.

B -- CHECK FOR DTC
A -- Continue to next step.

2. REMOVE OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING)

(a) Remove optional components (including associated wiring).

NOTICE:
Do not remove optional components or associated wiring without the permission of the customer.

NEXT -- Continue to next step.

3. CHECK FOR DTC

(a) Clear the DTCs Navigation System (for HDD).

(b) Check for DTCs and check if the same trouble occurs again.

OK:

No DTCs are output.

NG -- CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY POWER SOURCE)

OK -- END

4. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY POWER SOURCE)

(a) Disconnect the L113 radio receiver assembly connector.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - STEREO COMPONENT AMPLIFIER)

(a) Disconnect the L113 radio receiver assembly connector.

(b) Disconnect the R60 stereo component amplifier assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - DISPLAY AND NAVIGATION MODULE DISPLAY)

(a) Disconnect the L113 radio receiver assembly connector.

(b) Disconnect the L115 display and navigation module display connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. REPLACE RADIO RECEIVER ASSEMBLY

(a) Temporarily replace the radio receiver assembly with a new or normally functioning one Removal.

(b) Clear the DTCs Navigation System (for HDD).

(c) Check for DTCs and check if the same trouble occurs again.

OK:

No DTCs are output.

NG -- REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Removal

OK -- END