Test L: Open Abs Relay
NOTE:
DTC C1185 is generated when ABCM recognizes zero voltage at all HCU solenoids when battery voltage is expected. Possible contributing conditions include a defective ABS relay, blown ABS (60-amp) or HEGO (10-amp) fuse, low pull in voltage at relay, defective ABCM or HCU.
- Inspect ABS (60-amp) fuse and AIR COND (15-amp) fuse. If fuses are okay, go to step 4 . If ABS fuse is blown, go to next step. If AIR COND fuse is blown, go to step 3 .
- Disconnect ABS relay. Measure resistance between ABS relay harness connector terminal No. 87 (Black/Red wire) and ground. See Fig 1 . If resistance is greater than 10 k/ohms, replace ABS (60-amp) fuse and go to step 4 . If resistance is less than 10 k/ohms, repair Black/Red wire, and go to step 10 .
- Disconnect ABS relay and ABCM. Check resistance between ABS relay connector terminal No. 85 (White wire) and ground. If resistance is greater than 10 k/ohms, replace AIR COND (15-amp), and go to step 4 . If resistance is less than 10 k/ohms, repair White wire, and go to step 10 .
- Disconnect ABS relay. Turn ignition on. Measure voltage between ABS relay terminal No. 87 (Black/Red wire) and ground, and between terminal No. 85 (White wire) and ground. See Fig 1 . Turn ignition off. If voltages were greater than 10 volts, go to next step. If voltage was zero volts, repair Black/Red wire and/or White wire and go to step 10 . If voltage was 1-9 volts (insufficient voltage to pull in anti-lock relay), check battery and charging system. See appropriate GENERATORS article in STARTING & CHARGING SYSTEMS.
- Perform ABS relay component test. See ABS RELAY under COMPONENT TESTING. If ABS relay is okay, go to next step. If ABS relay is defective, replace ABS relay and go to step 10 .
- Install Breakout Box. Measure resistance between Breakout Box pin No. 57 and ABS relay harness connector No. 86 (Red/Yellow wire). See Fig 1 . Measure resistance between Breakout Box pins No. 57 and 60. If resistance between Breakout Box pin No. 57 and relay connector terminal No. 87 is less than 5 ohms, and greater than 10 k/ohms between Breakout Box pins No. 57 and 60, go to next step. If resistance were not as specified, repair Red/Yellow wire between ABS relay and ABCM, and go to step 10 .
- Disconnect ABS relay connector and HCU connector. Check resistance between Breakout Box pin 30 and ABS relay connector terminal No. 30 (Yellow wire). If resistance is less than 5 ohms. Measure resistance between Breakout Box pin 30 and ground (pin No. 60). If resistance is greater than 10 k/ohms, connect ABS relay and HCU connectors, and go to next step. If resistance is not as specified, repair Yellow wire between ABS relay and HCU.
- Using a jumper wire, connect Breakout Box pins No. 57 and 60. Turn ignition on. Measure voltage between specified Breakout Box pin and ground (pin No. 60). See HCU CIRCUIT CHECK table. Turn ignition off. If all voltages are more than 10 volts, replace ABCM and go to step 10
. If readings were not as specified, leave jumpers in place and go to next step.HCU CIRCUIT CHECK
Breakout Box Pin No. Circuit No. (Wire Color) 4 923 (Gray/White) 8 920 (Light Green/Black) 9 922 (Pink/White) 15 921 Pink/Gray) 31 903 (Pink) 47 902 (Brown) 49 904 (Purple) 50 905 (Blue/Orange) - Turn ignition off. Disconnect HCU connector. Turn ignition on. Measure voltage between ground and terminals No. 3, 4, 5 and 12 of HCU connector. See Fig 3 . Turn ignition off. If all voltages were greater than 10 volts, replace HCU and go to next step. If voltages were less than 10 volts, repair Yellow wire of affected circuit, then go to next step.
- Restore ABS system and connect all components. Clear continuous DTCs. Perform DRIVE CYCLE TEST . Retrieve and document continuous DTCs. If SYSTEM PASS is obtained, repair is complete. If SYSTEM PASS is not obtained and if original DTC is retrieved, go back to step 1 . If SYSTEM PASS is not obtained and a different DTC is retrieved, see DIAGNOSTIC TROUBLE CODE (DTC) INDEX table.