B15D1

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 an MOST communication error occurs between the display and navigation module display and radio receiver assembly, these DTCs will be stored.





HINT
For the MOST network, the display and navigation module display is the master unit.

WIRING DIAGRAM





INSEPCTION PROCEDURE

NOTICE:
* After replacing the radio receiver assembly of vehicles subscribed to pay-type satellite radio broadcasts, registration of the XM radio ID is necessary.
* Inspect the fuses for this circuit related to this system before performing the following inspection procedure.
PROCEDURE

1. CHECK OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING)

(a) Check for optional components.

(1) 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 an MOST communication error occurs due to electrical noise.
B -- CHECK 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 DTC

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

(b) Recheck 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 R19 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 R19 radio receiver assembly connector.

(b) Disconnect the S35 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)

(a) Disconnect the R19 radio receiver assembly connector.

(b) Disconnect the D26 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) Replace the radio receiver assembly Service and Repair.

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

(c) Recheck 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