Lexus ES: Extension Module Malfunction 2 (B1556)
DESCRIPTION
This DTC is stored when a malfunction occurs in the Navigation ECU.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
B1556 | Extension Module Malfunction 2 | When any of the following conditions is met: -
Internal power supply malfunction
-
Internal hard drive malfunction
-
EEPROM error
-
Storage malfunction
| Navigation ECU |
CAUTION / NOTICE / HINT
NOTICE:
-
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.
Click here
-
When replacing the navigation ECU, always replace it with a new one. If a navigation ECU which was installed to another vehicle is used, the following may occur:
-
A communication malfunction DTC may be stored.
-
The navigation ECU may not operate normally.
PROCEDURE
(a) Clear the DTCs.
Body Electrical > Navigation System > Clear DTCs
(b) Recheck for DTCs and check that no DTCs are output.
Body Electrical > Navigation System > Trouble Codes
OK:
No DTCs are output.
OK | | USE SIMULATION METHOD TO CHECK |
READ NEXT:
DESCRIPTION This DTC is stored if the remote touch (remote operation controller assembly) detects a malfunction in itself, such as internal hardware failure or remote touch screen sensor malfunction.
DESCRIPTION The multi-display assembly and parking assist ECU are connected via video signal (digital) lines. This DTC is stored when a video signal (digital) line is disconnected. DTC No. Detect
DESCRIPTION The radio receiver assembly and multi-display assembly are connected via video signal (digital) lines. This DTC is stored when a video signal (digital) line is disconnected. DTC No. D
SEE MORE:
INSTALLATION PROCEDURE 1. INSTALL STUD BOLT HINT: If a stud bolt is deformed or the threads are damaged, replace it. (a) Using an E8 "TORX" socket wrench, install the 2 stud bolts to the intake manifold. Torque: 10 N·m {102 kgf·cm, 7 ft·lbf} 2. INSTALL NO. 1 INTAKE MANIFOLD TO HEA
REMOVAL PROCEDURE 1. PRECAUTION (for HV Model) (a) w/o Navigation System: NOTICE:
When replacing the radio receiver assembly, always replace it with a new one. If a radio receiver assembly which was installed to another vehicle is used, the following may occur:
A communication malfunction DTC
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