Lexus NX: Telephone Main Antenna Circuit Short to Ground (B15CB11,B15CB13)
DESCRIPTION
This DTC is stored when the DCM (telematics transceiver) detects an open or a short in the telephone and GPS antenna (roof antenna assembly) circuit.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B15CB11 | Telephone Main Antenna Circuit Short to Ground | Telephone antenna (main) impedance (Ω) is lower than malfunction criterion for 10 seconds when power switch is on (IG). (Short circuit) |
|
| B15CB13 | Telephone Main Antenna Circuit Open | Telephone antenna (main) impedance (Ω) is higher than malfunction criterion for 10 seconds when power switch is on (IG). (Open circuit) |
|
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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HINT:
Refer to "PARTS LOCATION" for the installation location of telephone and GPS antenna cord.
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PROCEDURE
| 1. | CHECK DTC |
(a) Turn the power switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG) and wait for 10 seconds or more.
(d) Turn the Techstream on.
(e) Check for DTCs and check that no DTCs are output.
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OK:
No DTCs are output.
| OK | .gif) | USE SIMULATION METHOD TO CHECK |
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| 2. | INSPECT TELEPHONE AND GPS ANTENNA CORD (NO. 4 ANTENNA CORD SUB-ASSEMBLY) |
| (a) Disconnect the antenna connector from the roof antenna assembly. |
|
(b) Disconnect the antenna connector from the No. 2 antenna cord sub-assembly.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A-4 - B-1 | Always | Below 1 Ω |
| A-4a - B-1a | Always | Below 1 Ω |
| A-4 - Body ground | Always | 10 kΩ or higher |
| NG | | REPLACE TELEPHONE AND GPS ANTENNA CORD (NO. 4 ANTENNA CORD SUB-ASSEMBLY) |
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| 3. | INSPECT TELEPHONE AND GPS ANTENNA CORD (NO. 2 ANTENNA CORD SUB-ASSEMBLY) |
| (a) Disconnect the antenna connector from the No. 4 antenna cord sub-assembly. |
|
(b) Disconnect the antenna connector from the No. 1 antenna cord sub-assembly.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| B-1 - C-1 | Always | Below 1 Ω |
| B-1a - C-1a | Always | Below 1 Ω |
| B-1 - Body ground | Always | 10 kΩ or higher |
| NG | | REPLACE TELEPHONE AND GPS ANTENNA CORD (NO. 2 ANTENNA CORD SUB-ASSEMBLY) |
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| 4. | INSPECT TELEPHONE AND GPS ANTENNA CORD (NO. 1 ANTENNA CORD SUB-ASSEMBLY) |
| (a) Disconnect the antenna connector from the No. 2 antenna cord sub-assembly. |
|
(b) Disconnect the antenna connector from the DCM (telematics transceiver).
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| C-1 - TEL-1 (ANT1) | Always | Below 1 Ω |
| C-1a - TEL-1a | Always | Below 1 Ω |
| C-1 - Body ground | Always | 10 kΩ or higher |
| NG | | REPLACE TELEPHONE AND GPS ANTENNA CORD (NO. 1 ANTENNA CORD SUB-ASSEMBLY) |
|
| 5. | CHECK TELEPHONE AND GPS ANTENNA (ROOF ANTENNA ASSEMBLY) |
(a) Replace the telephone and GPS antenna (roof antenna assembly) with a known good one.
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(b) Clear the DTCs.
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(c) Recheck for DTCs and check that no DTCs are output.
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OK:
No DTCs are output.
| OK | | END (TELEPHONE AND GPS ANTENNA [ROOF ANTENNA ASSEMBLY] IS DEFECTIVE) |
|
| 6. | REPLACE DCM (TELEMATICS TRANSCEIVER) |
(a) Replace the DCM (telematics transceiver).
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NOTICE:
- The power switch must be off.
- Do not exchange the DCM (telematics transceiver) with one from another vehicle.
| NEXT | | PERFORM DCM ACTIVATION |
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