Lexus RX (RX 350L, RX450h) 2016-2023 Repair Manual: Backup Battery Internal Electronic Failure (B15CC49)

DESCRIPTION

This DTC is set when the DCM (telematics transceiver) detects one of the following:

  • The mobilephone battery voltage drops or the mobilephone battery malfunctions.
  • The mobilephone battery temperature is (temporarily) high.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B15CC49

Backup Battery Internal Electronic Failure

Mobilephone battery malfunction

  • Mobilephone battery
  • DCM (telematics transceiver)

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 Safety Connect System.

Click here

PROCEDURE

1.

CHECK DTC

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG) and wait for 10 seconds or more.

(d) Turn the Techstream on.

(e) Clear the DTCs.

Body Electrical > Telematics > Clear DTCs

(f) Check for DTCs and check that no DTCs are output.

Body Electrical > Telematics > Trouble Codes
OK

USE SIMULATION METHOD TO CHECK

NG

2.

CHECK MOBILEPHONE BATTERY

(a) Replace the mobilephone battery with a normal one and check if the same problem occurs again.

Click here

NOTICE:

The mobilephone battery must not be replaced while an ACN call is in progress.

Click here

(b) Clear the DTCs.

Body Electrical > Telematics > Clear DTCs

(c) Recheck for DTCs and check that no DTCs are output.

Body Electrical > Telematics > Trouble Codes

OK:

No DTCs are output.

OK

PERFORM INITIALIZATION

NG

3.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (telematics transceiver) with a new one.

Click here

NOTICE:

  • The engine switch must be off.
  • Do not exchange the DCM (telematics transceiver) with one from another vehicle.
NEXT

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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