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 |
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SEE MORE:
REASSEMBLY PROCEDURE 1. INSTALL VACUUM WARNING SWITCH ASSEMBLY (a) Install a new check valve grommet to the brake booster assembly. (b) Install the vacuum warning switch assembly to the brake booster assembly as shown in the illustration. *a 30° +/- 20° Up 2. INSTALL BRAKE VACUUM C
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