Stereo Component Amplifier Communication Error

NAVIGATION SYSTEM (for Double Cab): Stereo Component Amplifier Communication Error

Stereo Component Amplifier Communication Error

INSPECTION PROCEDURE

PROCEDURE

1. IDENTIFY COMPONENT SHOWN BY SUB-CODE





(a) Enter the diagnostic mode.
(b) Press the "LAN Mon" switch to change to "LAN Monitor" mode.
(c) Identify the component shown by the sub-code.

HINT:
- "140 (navigation receiver)" is the component shown by the sub-code in the example shown in the illustration.
- The sub-code will be indicated by its physical address.
- For the component list, refer to "DIAGNOSIS DISPLAY DETAILED DESCRIPTION" (Diagnosis Display Detailed Description).

NEXT -- Continue to next step.
2. CHECK POWER SOURCE CIRCUIT OF COMPONENT SHOWN BY SUB-CODE
(a) Inspect the power source circuit of the component shown by the sub-code.

Component table





If the power source circuit is operating normally, proceed to the next step.
NEXT -- Continue to next step.
3. INSPECT NAVIGATION RECEIVER





(a) Disconnect the K18 receiver connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





Result





C -- REPLACE NAVIGATION RECEIVER
B -- REPLACE NAVIGATION RECEIVER
A -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - COMPONENT SHOWN BY SUB-CODE)

HINT:
- Start the check from the circuit that is near the component shown by the sub-code first.
- For details of the connectors, refer to "TERMINALS OF ECU" (Pinout Values and Diagnostic Parameters).

(a) Referring to the AVC-LAN wiring diagram below, check the AVC-LAN circuit between the stereo component amplifier and the component shown by the sub-code.
(1) Disconnect all connectors between the stereo component amplifier and the component shown by sub-code.
(2) Check for an open or short in the AVC-LAN circuit between the stereo component amplifier and the component shown by the sub-code.
OK:
There is no open or short circuit.





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. REPLACE COMPONENT SHOWN BY SUB-CODE
(a) Replace the component shown by the sub-code with a normal one and check if the same problem occurs again.
OK:
Same problem does not occur.
NG -- REPLACE STEREO COMPONENT AMPLIFIER
OK -- END