Toyota Camry owners & service manuals

Toyota Camry: Microphone Circuit Open (B157213)

DESCRIPTION

This DTC is stored when the DCM (telematics transceiver) detects a malfunction in the telephone microphone assembly circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B157213

Microphone Circuit Open

Current at terminal MCVD is lower than the malfunction threshold for 10 seconds or more while the engine switch is on (IG)

  • DCM (telematics transceiver)
  • Roof console box sub-assembly (manual (SOS) switch)
  • Telephone microphone assembly
  • Harness or connector

WIRING DIAGRAM

w/ Sliding Roof w/o Sliding Roof

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:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

2.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

w/ Sliding Roof

A

w/o Sliding Roof

B

B

GO TO STEP 5

A

3.

CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - ROOF CONSOLE BOX SUB-ASSEMBLY)

(a) Disconnect the K140 DCM (telematics transceiver) connector.

(b) Disconnect the V14 roof console box sub-assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K140-5 (MCVD) - V14-9 (MACC)

Always

Below 1 Ω

K140-6 (MCI+) - V14-8 (MCO+)

Always

Below 1 Ω

K140-7 (MCI-) - V14-7 (MCO-)

Always

Below 1 Ω

K140-23 (SGND) - Body ground

Always

10 kΩ or higher

K140-5 (MCVD) or V14-9 (MACC) - Body ground

Always

10 kΩ or higher

K140-6 (MCI+) or V14-8 (MCO+) - Body ground

Always

10 kΩ or higher

K140-7 (MCI-) or V14-7 (MCO-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK DCM (TELEMATICS TRANSCEIVER) (TELEPHONE MICROPHONE ASSEMBLY POWER SOURCE)

(a) Remove the telephone microphone assembly but do not disconnect the connectors.

Click here

*a

Component with harness connected

(Roof Console Box Sub-assembly)

(b) Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

V14-9 (MACC) - Body ground

Engine switch on (ACC)

4 to 6 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

V14-7 (MCO-) - Body ground

Always

Below 1 Ω

OK

REPLACE TELEPHONE MICROPHONE ASSEMBLY

NG

GO TO STEP 7

5.

CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - ROOF CONSOLE BOX SUB-ASSEMBLY)

(a) Disconnect the K140 DCM (telematics transceiver) connector.

(b) Disconnect the V18 roof console box sub-assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K140-5 (MCVD) - V18-6 (MACC)

Always

Below 1 Ω

K140-6 (MCI+) - V18-5 (MCO+)

Always

Below 1 Ω

K140-7 (MCI-) - V18-4 (MCO-)

Always

Below 1 Ω

K140-23 (SGND) - Body ground

Always

10 kΩ or higher

K140-5 (MCVD) or V18-6 (MACC) - Body ground

Always

10 kΩ or higher

K140-6 (MCI+) or V18-5 (MCO+) - Body ground

Always

10 kΩ or higher

K140-7 (MCI-) or V18-4 (MCO-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

CHECK DCM (TELEMATICS TRANSCEIVER) (TELEPHONE MICROPHONE ASSEMBLY POWER SOURCE)

(a) Remove the roof console box sub-assembly but do not disconnect the connectors.

Click here

*a

Component with harness connected

(Roof Console Box Sub-assembly)

(b) Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

V18-6 (MACC) - Body ground

Engine switch on (ACC)

4 to 6 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

V18-4 (MCO-) - Body ground

Always

Below 1 Ω

OK

REPLACE TELEPHONE MICROPHONE ASSEMBLY

NG

7.

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.
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