DTC B2470
Diagnostic Instructions
DTC Descriptors
| DTC B2470 01: Cellular Phone Antenna Circuit
Short to Battery |
| DTC B2470 02: Cellular Phone Antenna Circuit
Short to Ground |
| DTC B2470 04: Cellular Phone Antenna Circuit
Open Circuit |
Circuit/System Description
The cellular phone antenna is connected to the Mobile Telephone
Control Module. This module supplies 5 V to the cellular phone
antenna to power the internal amplifier.
Conditions for Running the DTC
| • |
Ignition in the RUN or
ACCESSORY position. |
| • |
System voltage is between
9.5-15.5 V. |
| • |
The above conditions are
present for greater than 1 s. |
Conditions for Setting the DTC
The Mobile Telephone Control Module does not detect the presence
of a cellular phone antenna.
Action Taken When the DTC Sets
Mobile telephone communication can not be establish.
Conditions for Clearing the DTC
| • |
The Mobile Telephone Control
Module detects the presence of a cellular phone antenna.
|
| • |
A history DTC clears after 50
malfunction-free ignition cycles. |
Reference Information
Schematic Reference
Cellular Telephone Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Cellular Telephone Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Verify that the Cellular Phone Antenna assembly is not
damaged.
If the antenna assembly is damaged, replace the T4F Cellular Phone
Antenna or T4E Cellular Phone and Navigation Antenna.
Circuit/System Testing
Note: The vehicle may be
equipped with sectioned coax. Test each section and replace only
the faulty section, not the entire length of coax.
| 1. |
Ignition OFF, disconnect the
cellular coax cable connector at the T4F Cellular Phone Antenna or
T4E Cellular Phone and Navigation Antenna. |
| 2. |
Ignition ON, Test for 5 V
between the coax cable center wire and the outer coax
shield. |
| ⇒ |
If less than the specified range, test the coax
cable for an open/high resistance or a short to ground. if the coax
cable test normal, replace the K82 Mobile Telephone Control
Module. |
| ⇒ |
If greater than the specified range, test the coax
cable for a short to voltage. if the coax cable test normal,
replace the K82 Mobile Telephone Control Module. |
| 3. |
If all circuits test normal,
replace the T4F Cellular Phone Antenna or T4E Cellular Phone and
Navigation Antenna. |
Component Testing
Caution: Refer to
Test Probe Caution
Note: Before testing the
coax cable, check the cable exterior for being pinched, cut,
damaged, or having loose connections at the components, which can
cause reception issues.
To prevent false reading when testing the center coax
terminals, use care not to ground the test probe on the outer
housing/shield.
Coax Cable Test
| 1. |
Ignition OFF, disconnect the
coax cable at both components. |
| 2. |
Test for less than 5 Ω
between both ends of the coax cables center terminals. |
| ⇒ |
If greater than the specified range, replace the
failed coax cable. |
| 3. |
Test for greater than infinite
resistance between the coax cable center wire and the outer coax
shield. |
| ⇒ |
If less than the specified range, replace the coax
cable. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
