Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Indicator (Green) Circuit Short to Ground (B157111,B157113)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Audio & Visual & Telematics / Cellular Communication / Safety Connect System / Indicator (Green) Circuit Short to Ground (B157111,B157113)

DESCRIPTION

This DTC is set when the DCM (telematics transceiver) detects an open or short in the manual (SOS) switch green indicator circuit of the manual (SOS) switch. The manual (SOS) switch green indicator illuminates after the engine switch is turned on (IG).

If the safety connect system is not active, the manual (SOS) switch green indicator will turn off.

If the safety connect system is active, the manual (SOS) switch green indicator will blink while communicating with the call center.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B157111

Indicator (Green) Circuit Short to Ground

Manual (SOS) switch green indicator impedance (Ω) is lower than the malfunction threshold for 10 seconds or more when the engine switch is on (IG)
  • DCM (telematics transceiver)
  • Map light assembly (manual (SOS) switch)
  • Harness or connector

B157113

Indicator (Green) Circuit Open

Manual (SOS) switch green indicator impedance (Ω) is higher than the malfunction threshold for 10 seconds or more when the engine switch is on (IG)
  • DCM (telematics transceiver)
  • Map light assembly (manual (SOS) switch)
  • Harness or connector

WIRING DIAGRAM

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.

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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:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

2.

INSPECT MAP LIGHT ASSEMBLY (MANUAL (SOS) SWITCH) (GREEN INDICATOR)

(a) Remove the map light assembly (manual (SOS) switch).

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*a

Component without harness connected

(Map Light Assembly (Manual (SOS) Switch))

(b) Connect 2 dry-cell batteries (1.5 V each) in series.

(c) Connect a positive (+) lead from batteries to terminal 7 (IND2) and a negative (-) lead to terminal 9 (GND3) of the map light assembly (manual (SOS) switch) connector.

(d) Check if the manual (SOS) switch green indicator comes on.

OK:

Manual (SOS) switch green indicator illuminates.

NG

REPLACE ROOF CONSOLE BOX ASSEMBLY (MANUAL [SOS] SWITCH)

OK

3.

CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - MAP LIGHT ASSEMBLY (MANUAL (SOS) SWITCH))

(a) Disconnect the J157 DCM (telematics transceiver) connector.

(b) Disconnect the U12 map light assembly (manual (SOS) switch) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

J157-22 (IND2) - U12-7 (IND2)

Always

Below 1 Ω

J157-22 (IND2) or U12-7 (IND2) - Body ground

Always

10 kΩ or higher

J157-3 (SIG-) - U12-9 (GND3)

Always

Below 1 Ω

J157-3 (SIG-) or U12-9 (GND3) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

REPLACE DCM (TELEMATICS TRANSCEIVER)

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

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NOTICE:

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

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